To provide a locking and unlocking method for plural ranged throw-in port doors for classifying the refuse, capable of decreasing the number of projecting locks fitted to the surfaces of the doors to easily wipe off the surface of throw-in port doors and frames.

A lever handle 3 is fitted to the vicinity of the center of the ranged throw-in port doors 1, a rail movable material 10 is fitted to an operating shaft 5 interlocking with the lever handle 3, and a slide rail plate 12 provided with plural hooking projections 13 is connected to the rail movable material 10. In this arrangement, when the lever handle 3 is turned, the slide rail plate 12 is slid laterally, and simultaneously the hooking projections 13 and a door piece 14 are interlocked to perform locking and unlocking.