本ほん金きん庫こ

noun

main safe; main vault; main depository

Refers to the primary secure storage container or room, often in a bank or large institution, as opposed to smaller or secondary safes.

• 銀ぎん行こうの本ほん金きん庫こは地ち下かにある。

  The bank's main vault is in the basement.

• 重じゅう要よう書しょ類るいは本ほん金きん庫こに保ほ管かんされている。

  Important documents are kept in the main safe.