To allow a smooth and safe motion from one apparatus to another of different height, and lessen a caretaker's burden.

Many rubber rollers 2 are arranged on the upper part of a box structure 1, and a rubber roller part is raised or lowered. The internal space of bellows 3 contains a motor, a screw and nut, and an elevator link 4, and the rubber roller part is raised or lowered on the operation thereof, so as to agree to the height of an apparatus as a boarding object. Furthermore, a patient stops the operation of the roller part as soon as the part is flattened, places his/her buttocks on the rubber roller part and moves. The rubber roller part is, then, moved up to the height of an object apparatus, and the buttocks thereon are moved for the patient to board the apparatus.