How to Say “Of Course” in Japanese

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もちろん
mochiron
The Japanese phrase for "of course" is もちろん (mochiron).
もちろん is used to indicate enthusiastic agreement with a statement or request.
Meaning: indicates enthusiastic agreement (intj)

Which one should you use?

While もちろん expresses enthusiastic agreement, the related term 当たり前 can sometimes sound blunt or imply that something is "obvious" or "taken for granted," which might sound slightly rude depending on your tone.

Is there a formal and an informal way to say it?

Adding the particle さ to the end, as in もちろんさ, makes the phrase sound more casual and masculine. In formal Japanese, you can use 当然 to translate "of course".

Related words

Naturally (adv): 勿論, 当然, 当たり前.

How does it change in a sentence?

In Japanese, もちろん can be used at the beginning of a sentence to modify the entire following clause, similar to its position in English.

How do you pronounce it?

mochiron

Did you know?

  • The word もちろん is written with characters that literally translate to 'of course' or 'of the nature of things', reflecting a worldview where agreement aligns with the natural order.
  • In certain business contexts, instead of using 'of course', Japanese speakers prefer to use 承知いたしました (shouchi itashimashita) to show that they have understood and accepted a command.
  • While English speakers use 'of course' to be polite, saying もちろん to a superior might actually sound too casual or even slightly assertive, as it expresses strong personal conviction.

Examples in context

  • もちろんさ。
    Of course.
    This sentence shows how to use もちろん in a casual, masculine way.
    Tatoeba #193379 by bunbuku, translation #433492 by CK
  • もちろんいいとも。
    Of course, you may.
    This sentence demonstrates using もちろん to give permission.
    Tatoeba #193380 by small_snow, translation #30544 by Mediabat
  • もちろん、行くよ。
    Of course I will go.
    This sentence illustrates using もちろん at the beginning of a sentence to modify the clause.
    Tatoeba #9795383 by small_snow, translation #30533 by CC
  • 面接（めんせつ）に来（き）るのは当然（とうぜん）です。
    Coming to an interview is, of course, expected.
  • もちろんですよ！
    Of course!
  • 当然ですが、もちろんですよ！
    Naturally, of course!
  • 75 more sentences on Tatoeba

Example conversation

Ren asks Misaki if she wants to join his study group.

  1. 蓮 Ren

    美咲、僕の勉強会に来る？
    Misaki, boku no benkyoukai ni kuru?
    Misaki, do you want to come to my study group?
  2. 美咲 Misaki

    もちろん！喜んで。
    Mochiron! Yorokonde.
    Of course! I'd love to.
  3. 蓮 Ren

    本当？嬉しいよ。
    Hontou? Ureshii yo.
    Really? I'm happy to hear that.
  4. 美咲 Misaki

    一緒に頑張ろうね。
    Issho ni ganbarou ne.
    Let's do our best together.

Sources

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Carla Miriam
Carla MiriamHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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1 Comment
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Raf
Raf
January 24, 2026 23:07

domo arigato coseimas for helping us out. really appreciated!: would like to know that expression too

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