noun
treasure house; treasure room; storage for valuables
A room or building where treasures or valuable items are stored. Often used literally, but can also appear in metaphorical contexts (e.g., a museum as a treasure house of art).
博物館の宝物庫には貴重な美術品が保管されている。
Valuable works of art are kept in the museum's treasure house.
この図書館は知識の宝
This library is a treasure house of knowledge.
金庫 is a safe or strongbox for money and valuables, usually smaller and more secure than a 宝物庫.
Compound of 宝物 (treasure) + 庫 (storehouse). The reading is standard on'yomi.