To provide a bed device which can realize stable rise and fall of a frame by a space-saving and simple configuration.
The bed device includes: a base 11; a perpendicular slide mechanism 1 which goes up and down perpendicularly to the base 11; a frame 2 which is pivoted by the perpendicular slide mechanism 1; slide members 3b, 4b which have horizontal slide mechanisms 3, 4 and are placed away from the frame 2, connecting mechanisms 6-8 which are coupled rotatably between the horizontal slide mechanisms 3, 4 and the base 11; and an actuator 5 which is connected with at least one (3) of the horizontal slide mechanisms 3, 4, and moves up and down the frame 2 and the perpendicular slide mechanism 1 by rotating the connecting mechanisms 6-8 by changing the position of the slide members 3b, 4b by operation is prepared.