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.
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.