noun
ballot box
A sealed box into which voters place their ballots. Used in elections and formal voting contexts.
投票箱に一票を投じた。
I cast my vote into the ballot box.
開票のため、投票箱が開けられた。
The ballot box was opened for counting.
Compound of 投票 (voting) and 箱 (box). The reading is the standard on'yomi for each kanji.