To simplify a structure; to solve the problems of weight and cost increase; and to provide an easy-to-handle movable bed by making repetitive inclination for reclining the back and stretching the lower back part possible by one actuator.
The support floor of a mattress is divided into at least three of a back part support floor, a lower back part support floor and a leg part support floor, and a back raising shaft and a lower back raising shaft are freely turnably connected and fixed to a support base on the lower side of the support floor. A back raising arm and a back raising bracket are fixed to the back raising shaft and a lower back raising arm and a lower back raising bracket are fixed to the lower back raising shaft at a fixed angle. Stoppers for stopping the lowering of the back raising arm and the lower back raising arm are provided on the support base at positions corresponding to the back raising arm and the lower back raising arm. Between the back raising bracket and the lower back raising bracket, the actuator is freely turnably connected and fixed so that the extension/contraction length of the actuator is an intermediate length and the support floor is at a horizontal position.