Japanese Particles (助詞): The Eight Categories Explained
Japanese particles (助詞, joshi) are short, non-inflecting function words that attach to the end of a noun, phrase, or clause and assign it a grammatical role.1 They are the load-bearing wiring of every Japanese sentence: take them out, and the sentence does not just sound off. It stops parsing.
Overview
This page is the map. It defines what a 助詞 is, lays out the eight-category taxonomy used in Japanese school grammar, and points to a dedicated J-Compass article for every particle on the list.
The starting point is the eight-category cut used by the English-Wikipedia entry on Japanese particles and by the Japanese-Wikipedia entry on 助詞 (格助詞, 並立助詞, 副助詞, 係助詞, 接続助詞, 終助詞, 間投助詞, 準体助詞). J-Compass makes two pedagogical adjustments: 係助詞 is folded into 副助詞 (the line between them is a school-grammar artifact that does not change what the particle does), and 複合格助詞 (multi-token sequences like について and によって) is added as its own category because it is the standard cut in 日本語教育 (Japanese-as-a-foreign-language) pedagogy.123
The audience here is an N5 learner who has met five or six particles in isolation and wants the rest of the system in one place. The category labels stay useful through N3 and beyond.4
The eight-category section below is not a study list. It is a sorting frame. The actual learning happens in the per-particle articles linked throughout each category. Use the Reading order section at the bottom to choose which particle to open next.
What a Japanese particle is
The minimal definition
A 助詞 is one of the ten 品詞 (parts of speech) in Japanese school grammar. Two defining properties pin it down: it is 付属語 (bound: it cannot stand alone and must attach to a preceding word) and 非活用 (non-inflecting: it has no conjugational forms).1 Its job is to express the grammatical relationship that the word it attaches to holds in the larger phrase or clause.1
Because a 助詞 does not inflect, any suffix-like element that does inflect (です, だ, ます, ない, た, られる, せる) is classified as 助動詞 (auxiliary verb), not 助詞, even when it sits in the same position at the end of a clause.1
私は学生です。5
"I am a student."
本を読みます。6
"I read a book."
The colloquial Japanese name for the 助詞 class is 「てにをは」 (te-ni-wo-ha), taken from the four particles most often marked in the kunten (訓点) annotation system used by Heian and Kamakura scribes when they read classical Chinese texts in Japanese.17 If a Japanese teacher says a learner's てにをは is off, they mean the particles are off.
In English linguistic descriptions, 助詞 are usually called postpositions: function words that play the same grammatical role as English prepositions but appear after the noun they govern rather than before it.28
Why particles are postpositions, not prepositions
Japanese is a head-final SOV language. The verb closes the clause, modifiers come before the heads they modify, and adpositions follow rather than precede the noun they govern.98 Greenberg's typological Universal 4 states that languages with dominant SOV order are postpositional "with overwhelmingly greater than chance frequency," and Japanese is the textbook example.10
This is why a learner cannot say *に学校 for "to the school." The role marker has to come after its noun: 学校に. In diagram form:
The deep treatment of word order lives in the article on Japanese word order: SOV and the head-final principle.
学校へ行きます。6
"I'm going to school."
駅から歩きます。6
"I walk from the station."
How particles substitute for English word order
English assigns grammatical roles primarily by word order. In "the dog bit the man" and "the man bit the dog," subject and object swap purely because their positions swap.89
Japanese does not lean on word order for this work. The case-marking particles (格助詞) carry the role information, which leaves word order comparatively free. The same particles stay attached when the order is rearranged, so role-marking does not depend on position.8911
The canonical demonstration is a pair of sentences with the same words in different orders:
太郎が花子を見た。8
"Taro saw Hanako."
花子を太郎が見た。8
"Taro saw Hanako." (scrambled, same meaning)
Both sentences are grammatical and mean the same thing, because が marks the subject and を marks the object regardless of order. The deep treatment of why this scrambling works lives in the article on scrambling and word-order flexibility.
The eight categories of 助詞
The eight-category cut used by J-Compass is summarized in the diagram below.
Both the English-Wikipedia and Japanese-Wikipedia 助詞 articles present eight categories: 格助詞, 並立助詞, 副助詞, 係助詞, 接続助詞, 終助詞, 間投助詞, and 準体助詞.12 複合格助詞 is treated in adjacent entries rather than as a category on either page.3
J-Compass merges 係助詞 into 副助詞 for the learner and adds 複合格助詞 as its own class. That keeps the same eight-category total, but with slightly different membership. The rationale for the merge is at the start of the 副助詞 section below; the rationale for adding 複合格助詞 is at the start of that section.
格助詞 (case particles)
格助詞 attach to substantives (noun-class words) and mark the grammatical case the noun fills in its clause. Common roles include subject, direct object, location of existence, goal, source, instrument, accompaniment, comparison, and possession.112 In modern Japanese, the school-grammar inventory is ten particles: が, の, を, に, へ, と, から, まで, より, で.112
Of these, が, を, に, で, と, and の are the highest-frequency particles in any beginner corpus and all appear in Genki I Lessons 1–4 and Minna no Nihongo I Lessons 1–10.56
花が咲く。1
"A flower blooms."
兄の手紙です。1
"It's my older brother's letter."
机の上にあります。6
"It is on the desk."
友達と食べました。6
"I ate with a friend."
Each particle in this category has a dedicated J-Compass article: The が particle: subject marker (and more), The を particle: direct object, The に particle: a multi-function workhorse, The へ particle: direction marker, The で particle: means and location of action, The と particle: with, and, quote, The から particle: from (source and reason), The まで particle: until / as far as, The より particle: than / from (formal), and The の particle: possessive, nominalizer, attributive.
The location-particle contrast between に and で has its own dedicated comparison page, に vs. で for location in Japanese: existence vs. action.
Some descriptive grammars group は and が together as とりたて詞 (focus / topicalizing particles) and pull them out of the case-particle class, because は does not mark case. Standard school grammar still places が in 格助詞 and は in 係助詞 / 副助詞.121 J-Compass follows the school-grammar split: が is a 格助詞, は is a 副助詞.
副助詞 (focus / adverbial / binding particles)
副助詞 attach to a noun, an adverb, or even to the back of a 格助詞. They add nuance over the element they scope over: topic-marking, restriction, emphasis, addition, approximation, and dismissive listing.113 Their independence from case roles is the defining feature. A 副助詞 does not care whether the noun it sits on is a subject, an object, or something else.
The composite mid-textbook inventory is は, も, だけ, しか, ばかり, など, くらい/ぐらい, ほど, さえ, こそ, なんて/なんか, and the indeterminate-use か (the か in 誰か, 何か, いつか).113
Two cuts of this category exist in the school-grammar literature. Older 学校文法 separates 係助詞 (kakari-joshi: は, も, こそ, さえ, でも, しか) from 副助詞 (だけ, ばかり, ほど, くらい, など, etc.). Modern descriptive grammars and 日本語文法 references usually fold the two under a single "focus" or "とりたて" label.113
The 係助詞 / 副助詞 line is a 学校文法 inheritance that does not change what the particle does in a sentence. J-Compass keeps them under one roof.
田中さんも来ます。6
"Tanaka will come too."
千円だけ持っています。14
"I have only 1,000 yen."
水しか飲みません。14
"I drink only water."
子供さえ知っている。14
"Even a child knows."
The dedicated J-Compass articles for the members of this category are: The は particle: topic marker, The も particle: also, too, The だけ particle: only (limit), The しか particle: only (with negative), The ばかり particle: only / just / about to, The など particle: etc., such things as, The くらい / ぐらい particle: approximation and "about", The ほど particle: extent and comparison, The さえ particle: even, The こそ particle: emphatic identification, The なんて / なんか particles: dismissive listing, and the indeterminate-use side of The か particle: question marker (and disjunction).
接続助詞 (conjunctive particles)
接続助詞 attach to a 用言 (a predicate word: verb, i-adjective, or na-adjective + copula) and link two clauses into a compound sentence. They specify a relation such as condition, cause, contrast, concession, sequence, or coordination.115
The school-grammar core inventory includes ば (conditional), と (definite-result conditional), ても/でも (concessive), けれど(も) (contrast), が (contrast), のに (counter-expectation), ので (reason), から (cause), し (coordination of multiple grounds), て/で (sequence), ながら (simultaneous), たり (alternation), and つつ (concurrence).115
Beginners often blur this boundary: a 接続助詞 attaches to the end of the preceding clause's predicate, while a 接続詞 (conjunction) such as しかし, だから, or それで is an independent word that stands alone between two clauses.115 The first is bound to the verb; the second is a free word.
寒いから、コートを着る。14
"Because it's cold, I'll wear a coat."
雨が降っているのに、出かけた。14
"I went out even though it's raining."
安いし、おいしい。14
"It's cheap, and tasty too."
This hub treats each conjunctive particle only at the concept level: when to pick から over ので, what けれど(も) does that が cannot, and how ても scopes. Those forms live in their own subcategory dedicated to Japanese conjunctions and connectives.
終助詞 (sentence-final particles)
終助詞 attach to the very end of a sentence and add speaker stance: question marking, information-sharing, agreement-seeking, prohibition, emphasis, or exclamation.116 In spoken style, they carry register, dialog tone, and (conventionally) gendered associations.
The inventory includes か (question), の (rising-intonation question or falling-intonation emphasis), よ (informing the addressee of new information), ね (seeking agreement on shared knowledge), な (prohibition with the dictionary form, self-directed musing, or emphasis), ぞ (assertive warning), ぜ (colloquial emphasis), and わ (subjective assertion).116
行きますか。5
"Are you going?"
ご飯できたよ。1
"Dinner's ready (informing you)."
雨が降りそうだね。1
"Looks like rain, doesn't it?"
食べるな。1
"Don't eat (this)."
ぞ and ぜ are conventionally classified as masculine; sentence-final わ (rising intonation) and sentence-final の (in declaratives) are conventionally classified as feminine. These classifications come from the standard literature on gender differences in Japanese. That literature also notes that individual speakers do not necessarily speak in the ways attributed to their gender. A learner is better served by treating the labels as "this is the register association the dictionaries will give," not as "this is who is allowed to say this."1716
The deep treatment of each sentence-final particle is concept-level only on this hub. The forms have their own dedicated subcategory, sentence-final particles (終助詞).
並立助詞 (parallel / coordinating particles)
並立助詞 link two or more items of equal grammatical status into a list.18 Hashimoto Shinkichi's school grammar articulated the category as a separate class; older grammars folded these uses inside 格助詞 or 副助詞.1920
The inventory is と (exhaustive listing, "A and B"), や (non-exhaustive listing, "A, B, and the like"), とか (casual non-exhaustive listing), やら (uncertain non-exhaustive, "things like A and B"), か (alternation, "A or B"), なり (alternative listing, formal or literary), and だの (listing with a disparaging or annoyed tone).1821
The mid-textbook split between と, や, and とか runs along two axes: exhaustivity and register. と lists all the relevant items. や picks two or three from a larger set and implies "and so on." とか is the casual-register cousin of や.2114
パンと牛乳を買った。6
"I bought bread and milk."
パンや牛乳を買った。6
"I bought bread, milk, and the like."
ラーメンとかうどんとか食べたい。14
"I want to eat ramen, udon, things like that."
The dedicated J-Compass articles for this category are: the listing use of The と particle, The や particle: non-exhaustive listing "and", and The とか particle: casual non-exhaustive listing.
間投助詞 (interjectional particles)
間投助詞 are inserted mid-utterance, not at the sentence end. They keep speech rhythm going, hold the floor while the speaker thinks, or call the listener's attention back to the discourse.
The category is defined by position: the same surface forms (ね, よ) act as 終助詞 when they sit at the very end of a clause, and as 間投助詞 when they sit anywhere earlier in the utterance.122
The mid-utterance inventory is ね/な (rhythm-keeping, attention-holding), さ (attention-drawing, casual register), and よ (mid-utterance call-out, sometimes vocative).22
今日の授業さ、進むの早すぎなかった？22
"Today's class, didn't it move way too fast?"
ええとね、それでね…22
"Well, you know, and then, you see..."
おお勇者よ！22
"Oh, brave warrior!"
The deep treatment is concept-level only on this hub. Because the same forms appear in 終助詞 at clause-final position, most beginner-level coverage of ね and よ folds the 間投助詞 use into the 終助詞 article rather than splitting it into its own page.
準体助詞 (nominalizing particles)
準体助詞 attach after a predicate (a verb or adjective in its plain form). They convert the predicate phrase into a noun-equivalent that can take case particles, sit as a subject, or fill an object slot. The clearest case is の in 走るのが好きだ ("I like running"), where 走る is verbal but 走るの is nominal.23
The inventory is の (the canonical nominalizer) and ん (the casual contraction of の, as in 行くんです, 食べたいんです).2314
走るのが好きだ。23
"I like running."
彼に聞くのがいい。23
"It's best to ask him."
行くんです。14
"(It's that) I'm going."
The classification of 準体助詞 is genuinely disputed in the literature. Some grammars fold these uses inside 格助詞, treating の as a single particle with both a genitive use (私の本) and a nominalizing use (走るの). Others, including the Japanese-Wikipedia 準体助詞 entry, split them off because their syntactic distribution differs: genitive の attaches to a noun, while nominalizing の attaches to a predicate.231
J-Compass keeps 準体助詞 as its own category, consistent with the eight-category cut. The dedicated article that covers both uses is The の particle: possessive, nominalizer, attributive.
複合格助詞 (compound particles)
複合格助詞 are multi-word units that behave as a single particle and assign a single case-like role to the noun in front of them.3 Their typical shape is a 格助詞 followed by a て-form verb (について, によって) or a 格助詞 + noun + 格助詞 string (のために, と一緒に).
They are not in the school-grammar 助詞 inventory as a separate class. They are recognized as their own category in 日本語教育 (Japanese-as-a-foreign-language) grammar, which is the tradition any JFL learner is most likely to read.3
The high-frequency core is について (about, regarding), に関して (concerning, formal), に対して (toward, in contrast to), によって (by means of, depending on, or the agent in passives), にとって (for X, from X's perspective), において (at / in, formal), として (in the capacity of, as), のために (for the sake of), and と一緒に (together with).3
日本の歴史について話します。3
"I'll talk about the history of Japan."
学生にとって試験は大切だ。3
"For students, exams are important."
雨によって試合が中止になった。3
"Due to the rain, the match was cancelled."
複合格助詞 are predominantly formal and written. They are the default for academic writing, news, and official documents. The shorter 格助詞 (に, で, を) cover the colloquial register. A casual conversation that uses 雨で試合が中止になった expresses the same idea as the によって sentence above with less weight.3
The dedicated J-Compass articles for the five core compound particles are: The について compound particle: about / regarding, The に対して compound particle: toward / in contrast, The に関して compound particle: concerning / regarding (formal), The によって compound particle: by means of, depending on, and The にとって compound particle: for X / from X's perspective.
How the categories interact
The eight-category map is clean on paper but messier in real sentences. Several high-frequency particles belong to more than one category and pick up different jobs depending on what they attach to.
One surface form, multiple category memberships
The clearest cases are と, か, and の.
| Surface form | Categories | Sample uses |
|---|---|---|
| と | 格助詞 + 並立助詞 + 接続助詞 | 友達と話す (with), 「はい」と言った (quote), パンと牛乳 (list) |
| か | 終助詞 + 副助詞 + 並立助詞 | 行きますか (question), 何か (indeterminate), AかB (alternation) |
| の | 格助詞 + 準体助詞 + 終助詞 | 私の本 (genitive), 走るのが好き (nominalizer), 高いの？ (sentence-final) |
友達と話す。14
"I talk with a friend." (case use of と)
パンと牛乳。6
"Bread and milk." (listing use of と)
何か食べましょう。14
"Let's eat something." (indeterminate use of か)
Sorting which use is in play in a given sentence is the job of the per-particle articles. This hub's job is to flag that multi-membership is the norm, not an exception.
Stacking: は after another particle
A 副助詞 can layer on top of a preceding 格助詞 to topicalize or contrast the marked phrase. The fixed combinations a learner meets early are 〜には, 〜では, 〜とは, and 〜からは. The 格助詞 keeps its role-marking job: に still marks the destination, and で still marks the location of action. The は on top adds the topic-or-contrast layer.1424
学校には行きません。14
"As for to school, I don't go."
家では話しません。14
"At home, I don't talk (about it)."
友達とは話す。14
"With friends, I do talk."
One asymmetry to note: が and を do not stack with は. A topicalized subject drops its が, and a topicalized object drops its を. The other 格助詞 (に, で, と, から, へ, より) keep their case marker and add は on top.1411
The deep treatment of は (contrastive readings, topic-comment frame, double-が sentences) lives in The は particle: topic marker.
Particles vs. auxiliary verbs (助動詞)
Beginners blur this boundary most often: です, だ, ます, ない, た, られる, and せる are 助動詞 (auxiliary verbs), not 助詞. The reason is morphological. They all inflect:
| Form | Inflected forms |
|---|---|
| です | です → でした、でしょう |
| だ | だ → だった、だろう |
| ます | ます → ました、ません、ましょう |
| ない | ない → なかった、なくて |
A 助詞 by definition cannot inflect (the 非活用 property from the minimal definition above), so anything with a conjugation paradigm is not in the 助詞 class.1
学生です。6
"I am a student." (です is 助動詞)
食べました。6
"I ate." (ました is 助動詞, the past form of ます)
For deeper treatment of the copula and the 10-class 品詞 system, see The Japanese copula: です, だ, である explained and the parts of speech in Japanese page.
Reading order: which particles to learn first
The ordering below maps the J-Compass particle subcategory onto the standard JLPT level progression used across Genki, Minna no Nihongo, and the JLPT level-summary inventory.564
The N5 core (eight particles)
These are the eight particles every N5 sentence is built from. All appear in Genki I Lessons 1–4 and Minna no Nihongo I Lessons 1–10.56
- The は particle: topic marker
- The が particle: subject marker (and more)
- The を particle: direct object
- The に particle: a multi-function workhorse
- The で particle: means and location of action
- The へ particle: direction marker
- The と particle: with, and, quote
- The の particle: possessive, nominalizer, attributive
は vs. が is the single most-discussed beginner question in Japanese pedagogy; the dedicated entry-level comparison is は vs が in Japanese: a beginner's first pass.11145
The N5 finish line (six more particles)
These six more particles finish off the N5 inventory. They are standard in both Genki I and Minna no Nihongo I.56
- The から particle: from (source and reason)
- The まで particle: until / as far as
- The より particle: than / from (formal)
- The や particle: non-exhaustive listing "and"
- The も particle: also, too
- The か particle: question marker (and disjunction)
The N4 step (five particles)
The N4-level focus and limiting particles. Standard N4 inventory in JFL textbooks.1424
- The とか particle: casual non-exhaustive listing
- The だけ particle: only (limit)
- The しか particle: only (with negative)
- The ばかり particle: only / just / about to
- The くらい / ぐらい particle: approximation and "about"
The N3 step (focus particles and compounds)
The N3 inventory adds four heavier focus particles and the five high-frequency 複合格助詞.14243
- The ほど particle: extent and comparison
- The さえ particle: even
- The こそ particle: emphatic identification
- The なんて / なんか particles: dismissive listing
- The について compound particle: about / regarding
- The に対して compound particle: toward / in contrast
- The に関して compound particle: concerning / regarding (formal)
- The によって compound particle: by means of, depending on
- The にとって compound particle: for X / from X's perspective
Good to know
Reading vs. pronunciation: は as "wa", を as "o", へ as "e"
As particles, は, を, and へ are read /wa/, /o/, and /e/ respectively. The kana spellings are a frozen relic of 旧仮名遣い (historical kana usage), which was officially replaced by 現代仮名遣い in a 1946 Cabinet notification. The particle spellings were kept as exceptions because changing them would have disrupted the most frequent words in the language.25
The rule applies only to particle uses. Inside a content word, は reads /ha/ (花, hana, "flower"), を reads /o/ (the kana now appears almost exclusively as a particle in modern Japanese), and へ reads /he/ (部屋, heya, "room").2514
For the full explanation, see the three hiragana spelling exceptions: は, へ, and を as particles.
Why textbooks disagree on the category count
The 助詞 taxonomy comes from school grammar (学校文法), and school grammar itself has more than one cut.119 A learner reading two textbooks side by side may find any of the following: four categories (格助詞, 接続助詞, 副助詞 absorbing 係助詞, 終助詞); six (with 並立助詞 and 間投助詞 split out); or eight (the cut on both the English- and Japanese-Wikipedia 助詞 entries, which keeps 係助詞 separate from 副助詞 and adds 準体助詞).12
JFL (Japanese-as-a-foreign-language) pedagogy adds 複合格助詞 (multi-token sequences like について and によって). This class is not in the school-grammar 助詞 inventory, but it is standard in JFL reference grammars.3
J-Compass uses an eight-category cut that merges 係助詞 into 副助詞 and adds 複合格助詞 in its place. That is the most useful map for a learner navigating dictionary entries and grammar references from both school-grammar and JFL traditions.23
The "particle drop" myth in casual speech
Particles do get dropped in casual spoken Japanese. The dropping is not free. A learner who hears が disappear from one sentence and assumes it can disappear from any sentence is overgeneralizing.
Pedagogical sources draw a line between particles that can be omitted in casual speech (は, を, が, and the directional へ/に) and particles that cannot (the に of passives, causatives, and time expressions; で; と; や; の; and certain uses of は and が).26 The rule of thumb in JFL pedagogy is that drop is acceptable when the role is recoverable from context, but not acceptable in writing.26
Mnemonic: the postposition reflex
For an English speaker, the durable mental drill is "say the noun, then attach the role." English prepositions invite the learner to expect the role marker before the noun ("to the school"). The Japanese drill flips that: the noun comes out of the mouth first (学校), and the role marker arrives after (に).89
The head-final, SOV, and postpositional traits all push in the same direction. Once the noun-first habit is in place, every 格助詞, 副助詞, and 複合格助詞 fits the same word-after-noun template.8910
See also
- は vs が in Japanese: A Beginner's First Pass
- Topic vs. Subject in Japanese: The Hidden Slot
- How Japanese Grammar Works: A Big-Picture Overview
- Parts of Speech in Japanese: The 10 Classes (品詞)
- Japanese Word Order: SOV and the Head-Final Principle
- The Three Hiragana Spelling Exceptions: は, へ, and を as Particles