The Three Hiragana Spelling Exceptions: は, へ, and を as Particles

The three hiragana spelling exceptions are は, へ, and を when they act as particles. They are the only kana in modern Japanese whose reading changes based on grammatical role rather than phonetic context.¹ Beginners meet all three in their first few sentences, so it is worth nailing down the rule before other grammar settles on top of it.

Overview

The 1986 Cabinet Notification 「現代仮名遣い」 (Modern Kana Usage) governs how kana spellings map to sounds in standard Japanese. It splits its rules into two parts. 本文 第1 (main text, part 1) covers the regular phonetic principle; 本文 第2「表記の慣習による特例」 ("special cases following orthographic convention") gathers the carve-outs.¹

The three-particle rule is the longest entry in 第2 (part 2). It is also the only entry that affects every learner from lesson one.¹

What "spelling exception" means here

A spelling exception in this article is a kana whose reading changes by grammatical role, not by phonetic context.¹

Dakuten on か giving が, rendaku turning ひと into びと inside a compound, and the small っ doubling a following consonant are all phonetic-context shifts: the sound changes because of the sounds around it. Those are covered in the article Dakuten and Handakuten and in the broader hiragana reference.

The three-particle rule is different. The shape は does not change reading because of an adjacent sound. It changes reading because the kana is doing a grammatical job (marking a topic) rather than sitting inside a word. The shape is the same, and the neighbouring sounds are the same, but the role decides the sound.¹

The three exceptions at a glance

Kana	Default reading	Particle reading	Grammatical role that triggers the shift
は	ha	wa	Topic marker, after a noun phrase.1
へ	he	e	Direction or goal marker, after a place or person noun.1
を	wo (historical) / o (modern)	o	Direct-object marker, after a noun phrase that is the object of a verb.1

In modern standard Japanese, を is pronounced [o], identical to お, in ordinary speech. The NHK pronunciation dictionary records [o] as the prescribed broadcast reading.² In contemporary writing, を is used in effect only as the direct-object particle. Non-particle uses are confined to a small set of fossilized words and proper-noun spellings.³

Where this fits in the pre-N5 path

These three particles appear as soon as a learner meets their first sentence patterns: X は Y です, place へ 行く, object を verb.⁴ A reader who has just finished the base set in the Hiragana Chart article will run into all three exceptions before learning a single verb conjugation.

Pre-N5 placement is editorial

The official JLPT can-do list does not list spelling exceptions, so there is no can-do statement that places this rule at N5 or below. The pre-N5 framing reflects beginner-textbook sequencing (Genki I and Minna no Nihongo I introduce all three particles in their opening chapters), not an official level assignment.

The rule, exception by exception

は read as "wa" when it marks the topic

The rule from 本文 第2 (main text, part 2) is direct: 「助詞の『は』は，『は』と書く。」 ("The particle 'wa' is written は.") The particle pronunciation is /wa/, identical to わ. The same shape は, when read inside a word, is /ha/.¹⁴

これはペンです。¹
"This is a pen."

私わたしは学生がくせいです。¹
"I am a student."

今日きょうは日曜にちようです。¹
"Today is Sunday."

山やまでは雪ゆきが降ふりました。¹
"In the mountains, it snowed."

The form is neutral across speech, writing, and formal style. The 1946 notification kept は as the topic-particle spelling without marking it as tied to any register, such as formal or casual speech. The 1986 successor preserved that neutrality.⁵¹

へ read as "e" when it marks direction

The matching rule is 「助詞の『へ』は，『へ』と書く。」 ("The particle 'e' is written へ.") The particle pronunciation is /e/, identical to え. The same shape へ inside a word, as in 部屋 (heya) or 平和 (heiwa), is /he/.¹⁴

学校がっこうへ行いきます。¹
"I go to school."

故郷こきょうへ帰かえる。¹
"I return to my hometown."

The particle reading still applies when another particle attaches after it. In 「母への便り」 the へ stays /e/ even though の follows.¹

母ははへの便たより。¹
"A letter to my mother."

The へ and に particles overlap as direction markers in modern Japanese. The kana exception stays the same whichever form the speaker chooses.¹

を read as "o" when it marks the direct object

The rule is 「助詞の『を』は，『を』と書く。」 ("The particle 'o' is written を.") In modern broadcast Japanese, the standard pronunciation of the particle is [o], identical to お.¹²

本ほんを読よみます。¹
"I read a book."

水みずを飲のむ。¹
"I drink water."

やむをえない。¹
"It cannot be helped."

を has effectively no non-particle role in modern vocabulary. The wo-row collapsed into the o-row centuries ago, so beginners only need to memorize the particle reading.³

How to tell particle-は from word-は in a sentence

The test is positional, not lexical. A particle は, へ, or を stands alone between a noun phrase and the rest of the clause. It is never inside a single word.¹⁴

If the kana sits inside a kanji-plus-okurigana word or inside a katakana noun, the reading is the default: ha or he. In practice, this means ha or he only, since を is essentially particle-only.⁴

The decision is structural, and it is the same decision for all three:

A side-by-side contrast makes the structural difference concrete:

はい、そうです。⁴
"Yes, that's right." (は inside the word はい is /ha/.)

これは本ほんです。¹
"This is a book." (は as standalone topic particle is /wa/.)

Read the gap, not the shape

A particle sits at the seam between two units of meaning. If you can mentally slide a comma in front of the kana and the sentence still parses, the kana is a particle and takes the particle reading. If sliding in a comma would split a word in half, the kana is part of that word and takes its default reading.

Why these three, and why they stayed

The Heian-era ha-row pronunciation

In Old Japanese, the row now written ハ row was pronounced with a stop consonant /p/.⁶⁷ By the Early Middle Japanese (Heian) period, that /p/ had become the fricative /ɸ/, giving [ɸa ɸi ɸu ɸe ɸo].⁶⁷

The full trajectory is reconstructed as /p/ > /ɸ/ > /h/.⁶ In modern Japanese, /h/ is pronounced [h] before /a, e, o/, [ç] before /i/, and [ɸ] before /u/. This is why ふ still sounds bilabial today, with both lips involved.⁸

During the Heian period, sounds in the middle of a word began to behave differently from sounds at the start of a word. Medial /ɸ/ did not continue on to /h/. Instead it moved toward a [w]-like quality, setting up the next change.⁹

Ha-gyō tenko: how ha-row drifted to wa-row mid-word

ハ行転呼 (ha-gyō tenko) is the Heian-period sound change in which word-medial and word-final /ɸa, ɸi, ɸu, ɸe, ɸo/ shifted to /wa, wi, u, we, wo/. The shift passed through an intermediate bilabial approximant [β̞], a [w]-like sound made with both lips. It became general by the late Heian period, as shown by fluctuating kana spellings in period manuscripts.⁹⁶

The same change applied to は, へ, and を after a noun, because the particles sit phonologically inside the breath group rather than at the start of a word. For は the chain runs /pa/ > /ɸa/ > /wa/; for へ, /pe/ > /ɸe/ > /e/; for を, /po/ > /ɸo/ > /wo/ > /o/.⁶⁷

The same arc, viewed as a timeline:

Plenty of ordinary words went through this same shift, and their spellings were eventually updated to match. Each line below shows the historical spelling on the left and the modern spelling on the right:

• かほ (顔, face) became かお.⁹
• うへ (上, above) became うえ.⁹
• かは (川, river) became かわ.⁹
• こひ (恋, love) became こい.⁹
• あはれ (哀れ) became あわれ.⁹

The particles went through the same sound change at the same time. Their pronunciation stabilized along with the rest of the language, but their spelling did not.⁶⁷

This is why は, へ, を are pronounced as wa-row sounds even though the kana shapes are ha-row: the kana were fixed before the sound change, and the particles kept their pre-tenko spelling when the rest of the vocabulary was tidied up.⁷

The 1946 Gendai Kanazukai reform

「現代かなづかい」 (Gendai Kanazukai, 昭和21年内閣告示第33号) was promulgated on 16 November 1946 as part of the post-war spelling overhaul. It modernized historical kana usage so that spellings would generally follow modern pronunciation.⁵¹⁰

The 1946 notification explicitly carried the three-particle exception forward rather than respelling は, へ, を as わ, え, お. The exception survived the 1986 revision unchanged.¹¹⁰

The 1986 successor, 「現代仮名遣い」 (Modern Kana Usage, 昭和61年内閣告示第1号, 1 July 1986), groups the particle rule under 本文 第2「表記の慣習による特例」. The preamble states that the document establishes phonetic-based kana usage 「表記の慣習を尊重して一定の特例を設けるもの」 ("while setting certain special cases in respect for orthographic convention").¹¹¹

The official rationale is "respect for established orthographic convention"

The Cabinet notification itself does not explain the decision beyond that single phrase. Frequency-of-use and reader-disruption arguments are common in secondary commentary, but they cannot be attributed to the notification itself.¹¹¹⁰

Why を survived at all

By the late Heian period, を was already merging with お in pronunciation through ハ行転呼 and the parallel collapse of the w-row before vowels other than /a/. By Modern Japanese, を was [o], indistinguishable from お in ordinary speech.⁷⁶

The 1946 reform abolished ゐ (wi) and ゑ (we) from general use because they had merged with い and え in pronunciation and were no longer needed to distinguish words.³¹⁰

を was retained for a different reason. It had narrowed to a single, high-frequency role as the direct-object particle. Respelling it as お would have made the most common verb argument look the same as any other word containing お.³¹⁰ That sole-role status is what carried を through both the 1946 and the 1986 revisions even though it shares its pronunciation with お.³¹

Nuance and usage contexts

こんにちは and こんばんは: the frozen-particle greetings

「こんにちは」 and 「こんばんは」 are listed under 本文 第2 of the 1986 notification as canonical examples of the particle は.¹ Historically, they are shortened forms of clauses such as 「今日はご機嫌いかがですか」 and 「今晩はよい晩ですね」, in which 今日 or 今晩 is the topic and は marks it.⁴

Because the は is grammatically the topic particle, it is read /wa/ even though the rest of the original clause is no longer spoken. The spelling preserves the original sentence structure.¹

こんにちは。¹
"Hello."

こんばんは。¹
"Good evening."

The article Long Vowels in Hiragana covers a similar "frozen at an earlier stage" pattern for おう versus おお. The greetings belong to the same family of preserved spellings.

では, または, ではない: compound particles that keep the wa reading

本文 第2 lists 「もしくは」 and 「または」 among its canonical examples. The same logic extends to 「では」「には」「とは」「までは」「からは」「ばかりは」. In each one, は is still the topic particle attached to a preceding particle, so it is read /wa/.¹¹²

「ではない」 and 「ではありません」 retain the /wa/ reading for the same reason.¹

これではいけない。¹
"This won't do."

学生がくせいではありません。¹
"I am not a student."

へ in compound expressions and place names

へ takes the particle reading /e/ only when it stands alone after a noun. Inside a word, such as 部屋 (heya), 平和 (heiwa), or 平成 (Heisei), the kana belongs to the word's own reading and is /he/.⁴

A single sentence can carry both readings of the same kana:

部屋へやへ入はいる。¹⁴
"Enter the room."

The first へ sits inside 部屋 as /he/; the second is the standalone direction particle and reads /e/.

を in song lyrics, poetry, and older text

The [wo] pronunciation of を survives as a stylistic option in singing, enka, theatrical speech, and certain formal-stage delivery. The NHK pronunciation dictionary records [o] as the standard broadcast reading and treats articulated [wo] as marked rather than incorrect.²

A learner who hears を sung with a faint [w]-onset is hearing a register choice, not an alternative kana reading to imitate in everyday speech.²

Good to know

Why は, へ, を keep ha-row spellings despite wa-row pronunciation

The kana shapes were fixed before ハ行転呼 shifted word-medial /ɸ/ to /w/-quality in the Heian period. Ordinary words eventually updated their spellings: かほ became かお, うへ became うえ, あはれ became あわれ.⁹⁶ The three particles did not. Both the 1946 「現代かなづかい」 and the 1986 「現代仮名遣い」 kept the particle spellings under 「表記の慣習による特例」 (special cases following orthographic convention).¹¹¹

Treating は inside a word as the particle reading

A common early error is to apply the wa-reading wherever は appears, which turns はい ("yes") into something like wai. The kana は inside はい is part of the word itself, not a standalone particle, so it reads /ha/.⁴

はい、そうです。⁴
"Yes, that's right."

The role-conditioned rule applies only when は stands alone between a noun phrase and what follows.¹

Spelling the topic particle as わ

A second common error is to write the topic particle as わ to match its sound, producing 「わたしわ学生です」. The correct form keeps the historical kana: 「わたしは学生です」.

私わたしは学生がくせいです。¹
"I am a student."

The 1986 notification mandates the historical spelling for the particle: 「助詞の『は』は，『は』と書く。」¹

Typing on a romaji IME still uses ha, he, wo

The keystrokes for the particles on a romaji input method are ha, he, and wo, not wa, e, and o. The IME (input method editor) outputs the historical kana shape; the spoken reading does not change what you type. A learner who types "wa" gets わ, which is the wrong character for the topic particle.¹

The romanization split: Hepburn writes by sound, some textbooks by kana

Hepburn and Kunrei-shiki both transcribe the particles by sound: wa, e, o. Some beginner textbooks instead write ha, he, wo to keep the romanization in sync with the kana the learner is reading.³ Both conventions are in active use, so learners will see both depending on the textbook.

Three particles, three positions, one rule

As particles, は, へ, and を appear between words, never inside one. If the kana is its own grammatical unit, it reads /wa/, /e/, or /o/.¹ The rule is the same in all three cases; only the sound changes.

The articulated [wo] for を

Hearing を pronounced with a faint [w]-onset in songs, anime voice acting, or stage delivery is a stylistic choice, not a pronunciation error. The standard broadcast pronunciation is [o].²

Why ゐ and ゑ went away in 1946 but は, へ, を did not

ゐ (wi) and ゑ (we) had merged in pronunciation with い and え, and they no longer carried any functional load: no pair of words depended on the distinction. The 1946 reform abolished them.³¹⁰ を kept a unique, high-frequency role as the direct-object particle. は and へ also kept distinct grammatical roles, so the three particle spellings stayed even after their sounds had shifted.³¹⁰

See also

• Japanese Particles (助詞): The Eight Categories Explained
• は vs が in Japanese: A Beginner's First Pass
• The Japanese Consonant Inventory: Phonemes, Allophones, and the Kana Chart
• Japanese Focus Prosody: Pitch Widening, Contrastive は, and Information Structure
• Mixed Script: How Japanese Combines Kanji, Hiragana, and Katakana
• Hiragana, Katakana, or Kanji First? A Beginner's Script Order

References

Footnotes

1. 文化庁. 「現代仮名遣い」(昭和61年内閣告示第1号), 本文 第2「表記の慣習による特例」, 1986. https://www.bunka.go.jp/kokugo_nihongo/sisaku/joho/joho/kijun/naikaku/gendaikana/honbun_dai2.html ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵ ↩³⁶ ↩³⁷ ↩³⁸ ↩³⁹ ↩⁴⁰ ↩⁴¹ ↩⁴² ↩⁴³ ↩⁴⁴

2. NHK放送文化研究所 編. 『NHK日本語発音アクセント新辞典』. NHK出版, 2016. (Reference for the prescribed pronunciation of particle を as [o] in standard broadcast Japanese.) ↩ ↩² ↩³ ↩⁴ ↩⁵

3. Wikipedia. "Modern kana usage." https://en.wikipedia.org/wiki/Modern_kana_usage ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

4. Wikipedia. "は (kana)." https://en.wikipedia.org/wiki/Ha_(kana) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

5. 内閣. 「現代かなづかい」(昭和21年内閣告示第33号), 1946年11月16日. (Superseded by ¹ in 1986; particle exceptions carried over.) ↩ ↩²

6. Frellesvig, Bjarke. A History of the Japanese Language. Cambridge University Press, 2010, chapters on Early and Late Middle Japanese phonology covering the /p/ > /ɸ/ > /h/ lenition and ハ行転呼. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

7. Wikipedia. "Historical kana orthography." https://en.wikipedia.org/wiki/Historical_kana_orthography ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

8. Vance, Timothy J. The Sounds of Japanese. Cambridge University Press, 2008. (General reference for modern Japanese phonemes; cited for the [h]/[ç]/[ɸ] allophonic distribution of the modern ハ row.) ↩

9. ウィキペディア日本語版. 「ハ行転呼」. https://ja.wikipedia.org/wiki/%E3%83%8F%E8%A1%8C%E8%BB%A2%E5%91%BC ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

10. ウィキペディア日本語版. 「現代仮名遣い」. https://ja.wikipedia.org/wiki/%E7%8F%BE%E4%BB%A3%E4%BB%AE%E5%90%8D%E9%81%A3%E3%81%84 (Used for cross-checking the 1946 and 1986 notification numbers and dates only.) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

11. 文化庁. 「現代仮名遣い」(昭和61年内閣告示第1号), 前書き, 1986. https://www.bunka.go.jp/kokugo_nihongo/sisaku/joho/joho/kijun/naikaku/gendaikana/maegaki.html ↩ ↩² ↩³

12. ウィキソース. 「現代仮名遣い (昭和61年内閣告示第1号)」全文. https://ja.wikisource.org/wiki/%E7%8F%BE%E4%BB%A3%E4%BB%AE%E5%90%8D%E9%81%A3%E3%81%84_(%E6%98%AD%E5%92%8C61%E5%B9%B4%E5%86%85%E9%96%A3%E5%91%8A%E7%A4%BA%E7%AC%AC1%E5%8F%B7) ↩