noun
reason for arrest; grounds for arrest
Legal and police term referring to the specific justification for an arrest.
警察は逮捕理由を被疑者に告げなければならない。
The police must inform the suspect of the reason for arrest.
逮捕状 is an arrest warrant, while 逮捕理由 is the reason stated for the arrest.
Compound of 逮捕 (arrest) and 理由 (reason).