noun
A box or drawer for storing money, used in shops, offices, or for personal savings.
店員が金箱からお釣りを取り出した。
The clerk took out change from the cashbox.
noun
rich patron; financial supporter; income source
Figurative use: a person or entity that provides money, like a benefactor or a reliable source of income.
彼は地元の劇団にとって大切な金箱だ。
He is an important financial supporter for the local theater company.