“mube naru kana・gi naru kana”: No Wonder / Quite Natural (classical exclamation) [JLPT N1]
By Nihongo to Japan · Updated July 3, 2026
A classical Japanese exclamation of “only natural”
“mube naru kana・gi naru kana”: No Wonder / Quite Natural (classical exclamation)
「むべなるかな(宜なるかな)」 is a classical Japanese exclamation meaning “(this) is only natural, no wonder, indeed so” — a deep sigh of recognition at an inevitable, reasonable outcome. E.g. 「日頃の努力を思えば、彼の優勝もむべなるかな」 (given his daily effort, his victory is only natural). Archaic and solemn, it appears mostly in literary criticism and quotations of famous sayings.
🧠 Core nuance: a deep sigh of “just as expected, only natural”
The core is a classical exclamation at the inevitable/reasonable: seeing an outcome and feeling “given the causes, this is entirely natural, no surprise,” with a deep, sympathetic sentiment. むべ (宜) is “only natural,” and なるかな is the classical exclamatory ending (“…indeed!”). It equals the modern もっともだ・なるほど, but older and more evocative — written, literary language.
📌 How to Connect
| Form | Use | Example |
|---|---|---|
| (causes)…、〜もむべなるかな | sentence-final exclamation | 〜もむべなるかな |
| 宜なるかな (kanji) | same | 宜なるかな |
| modern equivalent | もっともだ・なるほど | (それも)もっともだ |
💬 Example Sentences
- 日頃の努力を思えば、彼の優勝もむべなるかな。(Given his daily effort, his victory is only natural.) — exclamation of inevitability
- あの実力なら、評価が高いのもむべなるかなだ。(With that ability, the high regard is only natural.) — recognition
- 長年の不摂生を思えば、病に倒れたのもむべなるかな。(Given his years of poor habits, falling ill is no surprise.) — sentiment
- 彼の人望を考えれば、リーダーに選ばれたのもむべなるかな。(Given his popularity, being chosen as leader is only natural.) — reasonable
- 努力家の彼が成功したのは、むべなるかなと言うべきだろう。(That a hard worker like him succeeded should be called only natural.) — commentary
🔄 Compare: むべなるかな vs もっともだ vs 当然だ vs べくして
| Expression | Nuance | Example |
|---|---|---|
| むべなるかな | “only natural, indeed!” (classical exclamation, literary) | 優勝もむべなるかな |
| もっともだ | “reasonable, only natural” (modern, spoken & written) | それももっともだ |
| 当然だ | “of course, natural” (direct) | 当然の結果だ |
| べくして〜た | “inevitably 〜” (looking back on what happened) | 起こるべくして起こった |
⚠️ Common Mistakes
- Using it casually: it's too archaic and literary; everyday speech uses もっともだ・当然だ.
- Treating かな as a question: here かな is a classical exclamatory particle (…indeed), not a question.
- Using it for unreasonable things: it's for outcomes that are natural (given the causes), not for the unexpected/unreasonable.
- Position: usually sentence-final, preceded by the causes that make it natural.
💡 Nuance & When to Use
むべなるかな is a classical, literary, written exclamation meaning “(this) is only natural, no wonder,” with a deep sympathetic sentiment, common in literary criticism, quotations, and solemn argument (given his effort, his victory is only natural). It equals the modern もっともだ・なるほど, but is more archaic and evocative. Never used in casual speech. You'll meet it in literary criticism and famous sayings. Master its classical exclamatory feel. A must at N1.
🎯 JLPT Exam Tips
- Commonly tested at N1: むべなるかな = only natural, no wonder (classical exclamation).
- Modern equivalent: むべなるかな ≒ もっともだ・なるほど.
- かな: here a classical exclamatory particle (…indeed), not a question.
🖊️ 練習題（5 題）
Q1. 「むべなるかな」の意味に最も近い現代語はどれか？
(A) もっともだ／なるほど（理所當然・確實如此） (B) とんでもない
(C) まさか (D) もしかすると
Q2. 「日頃の努力を思えば、彼の優勝も___。」（想到他平日的努力，他奪冠也是理所當然的）
(A) むべなるかな (B) とんでもない (C) やむをえない (D) どころではない
Q3. 「むべなるかな」が使われる場面として最も適切なものは？
(A) 文学評論や名言の引用など、古典的・書面的な感嘆
(B) 友達との軽い雑談
(C) ビジネスメールの依頼
(D) 道を尋ねるとき
Q4. 「むべなるかな」の「かな」の働きとして正しいものは？
(A) 古典の詠嘆（感嘆）の助詞
(B) 疑問を表す助詞
(C) 否定を表す助動詞
(D) 命令を表す
Q5. 「むべなるかな」の語感として最も適切なものは？
(A) 「確實，那是理所當然的啊」という深い感嘆
(B) 「絕對不可能」という強い否定
(C) 「請務必」という丁寧な依頼
(D) 「完全不懂」という困惑
答案解析
1. (A) もっともだ／なるほど ── 「むべなるかな」＝理所當然・確實如此。
2. (A) むべなるかな ── 表示對必然結果的古典感嘆。
3. (A) ── 多用於文學評論・名言引用等古典書面場合。
4. (A) 古典の詠嘆の助詞 ── 「かな」是古典感嘆助詞。
5. (A) ── 帶有深沉的「確實如此」之感嘆。