To provide a bed frame which is a back raisable bed, is provided with an elevating and lowering mechanism capable of being elevated and lowered in a vertical direction and can use a floor traveling type lifting device or the like.

A pair of left and right side part frames is constituted by providing an upper frame so as to be freely vertically slidable to a lower frame to which a connection pipe in a chevron shape in the side view is fixed, and the bed frame is constituted roughly in a U shape with an open front side in the plane view by turning and connecting connecting members provided on the side part frames. The bed frame is provided with the elevating and lowering mechanism constituted so as to transmit elevating and lowering drive power by screw-fitting of a screw by a cable body.