To perform a vibration isolation operation by rationally utilizing force by the vibration of an earthquake or the like applied in the moving direction of respective shelves and turning the shelves in a lock state to a movable state when a moving shelf is locked.

In the moving shelf, rotary driving force is transmitted through a transmission mechanism by a sprocket and a pulley, etc., to a traveling wheel. Then, the moving shelf is provided with a weight 15 to be slid by receiving the vibration along the traveling direction and the sliding movement of the weight 15 is converted to the direction of removing a key member 12 fitted on the rotating shaft 8 of the transmission mechanism or the traveling wheel. Thus, the key member 12 of the rotary shaft 8 is removed from a key groove 13 and a rotating body 9 attached through the key member 12 to the rotary shaft 8 is turned to a freely rotatable state.