To move a bed lift to an optional place and lift a ready-made bed as it is by making up the lift of a moving means capable of moving a support to an optional place, a mounting portion that can be put under a ready-made bed and can carry the bed, and a lifting portion capable of lifting the mounting portion to a desired height.

Firstly, with a mounting portion 12 folded, a movable bed lift 1 is moved to a desired bed, using castors 20. Subsequently in a space below the bed, the mounting portion 12 is spread and put under the bed and the mounting portion 12 is advanced to the bed to mount uniformly the bed on the mounting portion 12. When a worm gear and a rotating member 14a are rotated by driving a motor 16a, to lift a support member 18 along the spiral groove of the rotating member 14a, the mounting portion 12 and the bed are lifted together with the support member 18. At this time, as the castors 20 are fixed by the self-weight of the castors 20, the movable bed lift 1 never moves during the lifting of the bed.