To prevent dust and pebbles from entering a guide groove of a door sill by forming the guide groove in a lower face of the door sill, forming an insertion hole along the guide groove, and attaching a support piece which supports a door shoe which is fitted in the guide groove through the insertion hole slidably to a door.

Door sills 9, 10 are provided in an inlet and outlet 1 on a landing place side and an inlet and outlet 2 on a cage side through angle steal 11, 12, respectively. The door sills 9, 10 have upper faces 9a, 10a which face upward in the vertical direction and lower faces 9b, 10b which face downward, and guide grooves 13, 14 are formed in these lower faces 9b, 10b. Insertion holes 15, 16 are formed in the door sills 9, 10 along these guide grooves 13, 14, and support pieces 19, 20 which support door shoes 17, 18 which are fitted into the guide grooves 13, 14 slidably are attached to doors 3, 6 through these insertion holes 15, 16. Consequently, it is possible to prevent dust and pebbles from entering the guide grooves 13, 14 in the door sills 9, 10 and open and close the doors 3, 6 smoothly.