なるほど

Japanese Grammar Advanced Japanese ★★★★ 4/5 neutral なるほどnaruhodo
読み なるほど
ローマ字 naruhodo
形 なるほど（、Sentence） / なるほど + Clause + が/けれど

意味

An adverb meaning 'indeed,' 'I see,' or 'that makes sense,' used when the speaker acknowledges and affirms the correctness or reasonableness of something they have just heard or realised. It signals understanding and agreement.

なるほど serves both as a conversational response (similar to 'I see' or 'ah, that makes sense') and as an adverbial modifier meaning 'indeed' or 'certainly' within a sentence. When used mid-sentence, it often appears in a concessive pattern — なるほど～が/けれど (indeed X, but Y) — acknowledging one point before countering it. As a standalone response, it shows the listener has processed new information and finds it convincing. It is less formal than おっしゃる通り and more substantive than ああ or そうですか. Note that overusing なるほど in response to a superior can sound dismissive in business settings.

例文

  1. なるほど、その観点から見れば彼の判断は合理的だったと言える。
  2. 説明を聞いて、なるほど制度改革が必要な理由がよく分かった。
  3. なるほど理論としては正しいが、実際に運用するのは容易ではない。

使い方ガイド

場面: spoken, written, everyday

トーン: agreeable

正しい言い方

  • なるほど、そういう事情があったのですね。納得しました。
  • 現地を視察して、なるほど住民の不満がもっともだと感じた。
  • なるほど効率は上がるかもしれないが、品質管理の面で懸念が残る。

避ける言い方

  • なるほど、お水をください。(Using なるほど as a filler before an unrelated request) → すみません、お水をいただけますか。
  • 部長の説明に対してなるほどなるほど。(Repeating なるほど to a superior can sound dismissive or inattentive in business) → 部長、おっしゃる通りだと思います。

起源と歴史

なるほど combines 成る (naru, to become/result in) with 程 (hodo, degree/extent). Literally 'to the degree that it becomes so,' it evolved from expressing the extent of truth to a marker of convinced understanding.

文化的背景

世代: All ages

社会的背景: Universal

関連フレーズ

つい An adverb meaning 'unintentionally' or 'inadvertently,' used when someone does something without meaning to or without being able to control the impulse. It conveys that the action happened against the speaker's better judgement or awareness. なお An adverb with two primary functions: indicating that a state or action is still continuing ('still'), and serving as a conjunctive adverb to add supplementary information ('furthermore' or 'additionally'). Both uses are common in formal writing. あえて An adverb meaning 'dare to' or 'deliberately,' used when the speaker chooses to do something despite knowing it may be difficult, risky, or contrary to expectations. It conveys a sense of resolve or intentional defiance of the easier or more conventional path. あくまでも An adverb meaning 'to the very end,' 'strictly,' or 'nothing more than,' used to express unwavering persistence in an attitude or to limit the scope of a statement. It conveys the speaker's firm stance that something will not change regardless of circumstances. いかに An adverb meaning 'how' or 'how much,' used to emphasise the degree or manner of something. It is more formal and literary than どんなに or どれほど and frequently appears in written Japanese and speeches. およそ An adverb with two main uses: as an approximation marker meaning 'approximately' or 'roughly,' and as a totality marker meaning 'at all' or 'utterly' when used with negatives. It adds a formal, measured tone to statements. さぞ（かし） An adverb meaning 'surely,' 'no doubt,' or 'I can only imagine,' used when the speaker empathetically infers that someone must be experiencing a strong emotion or condition. It expresses sympathetic conjecture about another's feelings. なおさら An adverb meaning 'all the more' or 'even more so,' indicating that the degree of something increases due to an additional factor or condition. It expresses that a situation that was already notable becomes even more pronounced.
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