noun
tool storage room; equipment room
A room for storing tools, equipment, or supplies, often found in schools, offices, or workshops.
用具室からハンマーを持ってきてください。
Please bring a hammer from the tool storage room.
学校の用具室には体育の道具がしまってある。
The school's equipment room stores physical education gear.
物置 is a small storage shed or closet for miscellaneous items, whereas 用具室 implies a dedicated room for tools or equipment.
Compound of 用具 (tool, equipment) and 室 (room).