I came across the following passage in a mystery manga. The main character is explaining that the as of yet unknown criminal intentionally made the listener think that Kimisawa was the criminal (though she is not).

It's likely that that guy (奴) incorporated it into his plans that you'd be under the impression that the criminal was Kimisawa. He made you smell that perfume on purpose!

Unless I am mistaken, it seems to me that the subject/complement of だ is denoted with を which I thought was unacceptable. Could someone please explain when and if this is allowable?

  • 「君沢さん犯人と思い込む」のところですか、それとも「香水の匂いかがせたん 」のところですか? -- ああ、わかりました、「君沢さん犯人だ(と思い込む)」って意味のことを「君沢さん犯人だ(と思い込む)」って言えるのか、ってことですね。
    – Chocolate
    Dec 14, 2017 at 3:17

2 Answers 2


AをBだ in isolation makes little sense (although there are minor exceptions). This ~を~だと is a common pattern which appears along with various verbs for assuming, regarding, etc.

  • AをBだと見なす to regard A as B
  • AをBだと考える to consider A B
  • AをBだと仮定する to assume A is B
  • AをBだとする to suppose A as B
  • AをBだと思う to think of A as B
  • AをBだと勘違いする to mistake A as B
  • AをBだと思い込む to make a wrong assumption that A is B
  • AをBだと定義する to define A as B
  • AをBだと受け取る to take A as B
  • AをBだと解釈する to interpret A as B

So Bだと is like as B, and these verbs can take both を and だと at the same time.

EDIT: だ before を can be omitted in many cases. 君沢さんを犯人と思い込む (without だ) and 君沢さんが犯人だと思い込む are equally correct. For details, see Difference between だと vs と before 認める


I don't know if it's allowable per say, but it's clear that お前が君沢さんを犯人だ is meant to be a thought in it's own right, which is what (that guy) took into consideration.

I would guess what it's supposed to mean is

that (that guy) assumed you would assume Kimazawa is the criminal, and so he had you? smell that perfume.

As for correctness, I was able to find another example on Linguee that uses を犯人だ


And it kind of makes sense. The subject is attributing object being some noun.

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