Savings Box
Piggy Bank, Bank, Money Box
noun
Remember how 貯金 is your savings? A box you put said savings in is a savings box.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
長男が学校で貯金箱を作ってきました。
My oldest son made a piggy bank at school.
10才の時に始めた500円玉貯金箱が、ついにいっぱいになりました！
The 500-yen coin piggy bank that I started when I was ten years old is finally full!
コウイチの貯金箱は、私の貯金箱とは比較にならない程大きい。
Koichi's piggy bank is much bigger than mine, to the point where you can't even compare them.
兄は、十年前に私の貯金箱を盗んだ事を白状しました。
My brother confessed that he had stolen my piggy bank ten years ago.