collection box; donation box
A box placed in public spaces to collect monetary donations, often for charity or relief efforts.
駅前に募金箱が置いてあった。
There was a donation box in front of the station.
Compound of 募金 (ぼきん, 'fundraising, donation') and 箱 (はこ, 'box'). The reading ばこ is a rendaku form of はこ.