Abstract: A bed includes a bed body, ascending and descending means, and an auxiliary leg member. The bed body has a floor frame, and a main leg member fixed to the floor frame. The ascending and descending means has an ascending and descending link, and an extensible and retractable actuator for operating the ascending and descending link. The ascending and descending link holds the bed body with one of the opposite ends, and it holds the auxiliary leg member with the other one of the opposite ends. For instance, the ascending and descending link constitutes a parallel link, the floor frame constitutes one of the parallel elements of the parallel link, and the auxiliary leg member constitutes the other one of the parallel elements of the parallel link, thereby enabling the whole bed body including a mattress to ascend and descend.

Abstract: A bed unit for saving space wherein a head end portion and a foot end portion of a frame are, respectively, movable along a wall and a floor by a driving mechanism. Thus, preparation for bed making or placing the frame back in the wall can be performed with relative ease. The bed unit includes a mattress positionable in a wall and on a floor for saving space which includes a frame on which the mattress is mounted, a first support mechanism for supporting the frame and a head side thereof, a second support mechanism for supporting the frame at a foot side thereof, a mechanism for rotatably mounting the second support to the frame and a mechanism for moving the frame such that a head end portion of the frame is moved along the wall and a foot end portion of the frame is moved along the floor.