ちょうほんにん
originator; ringleader; perpetrator; main culprit
Common word Also written 帳本人
Noun
このうわさの張本人ちょうほんにんはだれだ？
Who is at the bottom of these rumors?
トムが事故じこを引ひき起おこした張本人ちょうほんにんなんだ。
Tom is the one who caused the accident.