主しゅ犯はん格かく

noun

key culprit; principal offender

Legal term for the main perpetrator in a crime, as opposed to accomplices or accessories.

• 警けい察さつは主しゅ犯はん格かくの男おとこを逮たい捕ほした。

  The police arrested the man who was the principal offender.

• この事じ件けんでは、主しゅ犯はん格かくが最もっとも重おもい刑けいを受うけるだろう。

  In this case, the key culprit will likely receive the heaviest sentence.