To provide elevating/declining mechanism desired by a user for an electric bed by adding an adjustment function to a connecting rod that interlocks operation function of the bottom structure as an electric bed.

In an elevating/declining bed with a first to a fourth bottom, a back arm with back rollers is installed in the lower part of the first bottom, and a leg arm with leg rollers is installed in the lower part of the third bottom. A connection link and the back arm are freely slidably connected with a slide pin, an actuator and the back arm are freely rotatably connected, and the back arm and the leg arm are freely rotatably connected with the connection link. A slide slot in which the slide pin is freely slidable is provided in the connection link. Further, such structure is provided for the elevating/declining bed that an extending/contracting movement of the actuator is propagated to the back arm and the connection link connected to the slide pin and is made controllable at the adjustment position of an angle for raising legs.