A third aspect of the invention is a stretcher characterized in that the non-step stopper mechanism comprises a mechanical lock structure
. By adopting the mechanical lock structure for stopping the movement while the height of the stretcher is changed up/down, unlike a mechanism in which a pin is inserted into a previously formed hole, stop position and fixing position are not limited to specific positions. Accordingly, there is no amplification of pain due to the vibration generated by insertion of the pin into the hole, or danger of sudden lowering of the stretcher manufacturers due to such malfunction as a fail of the pin being inserted into the role etc, as the case of the conventional mechanism.