PURPOSE: To make a service cage reach in accordance with the prearranged time of reaching, by inhibiting the reopening of a door of a 2nd platform when a reaching delay detecting circuit, which detects a fact that reaching may be later than the prearranged time of reaching computed, operates.

CONSTITUTION: Supposing platform descent calling is registered at a 5th story, and a No.1 machine stopping at a 1st story is assigned for the calling. When a service cage is assigned, a reaching expected time computer A computes the expected time of the reaching of the cage at that point of time, and the value is displayed to a reaching prearranged time device B in the descent direction of the 5th story. When the expected time is larger than the prearranged time, the reopening of a door is inhibited by a 5th story descent calling reaching delay detecting circuit 5Dd, the door is shut and the cage starts in order to respond to the descent calling of the 5th story. Thus, the door is not opened and the cage is early started even if a platform button of the 1st story where the cage stays is depressed when the cage may be later than displayed reaching prearranged time.