noun
subsidiary bank account; secondary account
Finance term for a secondary or subsidiary bank account, often contrasted with a main bank account (メーンバンク).
See also: メーンバンク
給与はメーンバンクに振り込まれ、副業の収入はサブバンクに入れている。
My salary is deposited into my main bank account, and my side-job income goes into my subsidiary account.