PURPOSE: To set entrance doors easily even though the interval between floors is small by arranging the door devices provided at the neighboring upper and lower floor entrances slipping in the longitudinal direction each other.

CONSTITUTION: A hanger case 5B of the lower floor is provided at the outer side than a holding beam 9A of the upper floor. An entrance door 4B of the lower floor is farther from a cage than an entrance door 4A of the upper floor, and thereby, an engaging device projecting from the rear side of the entrance door 4B of the lower floor to engage with the cage door is composed longer than the engaging device of the entrance door 4A of the upper floor in the projecting size. The weight applying to a threshold 8A of the upper floor is supported by the holding beam 9A and an entrance floor 2A. As a result, even though the interval between the floors is small, the entrance doors 4A and 4B can be set easily.