To provide a mobile shelf to be equipped with wheels for moving the shelf without causing dents and protrusions on a floor by the action of pressure of the wheels, and having a simple guide mechanism for the wheels.

Between a pair of stationary shelves standing on the floor 1 at the front and rear, a mobile shelf 5 is placed so as to be capable of reciprocating movement in front and rear freely on a specific route and is supported on the wheels 3. The guide rail 17 having the guide groove 16 along the specific rail is placed between the stationary shelves. The guide rollers 29 are equipped to the mobile shelf 5 that is to be freely movable along the guide rail 17 with respect to the inside of the guide groove 16. On the floor 1, the reinforcement plate 36 is placed in the travelling range of the wheels 3.