noun
Often used for a dedicated room or building where valuable items such as artworks, documents, or museum pieces are stored and preserved.
美術館の収蔵庫には、普段は展示されていない作品がたくさん保管されている。
In the museum's storage room, many works that are not normally exhibited are kept.
Compound of 収蔵 (しゅうぞう, 'collection and storage') + 庫 (こ, 'warehouse, repository').