To provide an elevating/lowering device for a bed, which has a simple structure, and to provide a bed including the elevating/lowering device for the bed, which has the simple structure.

The elevating/lowering device for the bed is composed of a plurality of floor board units respectively including frame parts placed on a frame body and floor board parts to place bedding on the upper surface. A driving means for elevating/lowering the floor board part is provided at each floor board unit. The respective floor board units are mutually independently placed on the frame body. The elevating/lowering device for the bed is composed of the plurality of floor board units, so as to be simple.