To provide a silently operable interlock all lock device for reducing the number of part items, while having the interlock function of, when pulling out one of a plurality of stages of drawers arranged in a cabinet body, making pulling-out of the other drawers impossible and the all lock function of locking the whole drawers at once.

This interlock all lock device is composed of a vertical rod vertically movably held in the cabinet body having the plurality of stages of drawers, a pushing-up member installed on the vertical rod in response to the respective drawers, a rotary stopper member installed in a predetermined height position of the cabinet body in response to the respective drawers under the pushing-up member a predetermined dimension, an operation pin arranged in the drawers, vertically moving the pushing-up member and rotating the rotary stopper member, and a lock for positioning a stopper projection part of the pushing-up member in front of the operation pin by lifting the vertical rod in locking and positioning the stopper projection part under the operation pin in unlocking.