noun
case file; incident record
A file or record that documents the details of an incident, often used in police, legal, or investigative contexts.
警察は事件簿を調べて、類似の手口を探した。
The police examined the case files to look for similar methods.
記録 is a general record or log, whereas 事件簿 specifically refers to a file or ledger of incidents.
Compound of 事件 (jiken, 'incident') and 簿 (bo, 'record book'). The exact historical derivation is uncertain, but the word is a straightforward modern compound.