noun
party to the case; parties concerned
Legal term referring to a person directly involved in a case or incident, such as a plaintiff, defendant, or subject of investigation.
事件本人の同意なしに情報を公開することはできない。
Information cannot be disclosed without the consent of the party to the case.
警察は事件本人から事情を聴いている。
The police are questioning the person concerned in the case.
Compound of 事件 (case, incident) and 本人 (the person himself/herself). The exact historical derivation is uncertain, but the term is used in modern legal and formal contexts.