To provide a muscle force training device which enables an aged person and a sick person with weakened body functions to strengthen the muscle force of upper and lower limbs and maintain and improve the upper and lower limbs and a joint movable area on a bed.

Side rails 11 are provided on both sides of the bed 10. A frame 20 is a roughly U-shaped frame, columns 21 on both sides and a columnar top rod 22 integrally connecting the upper ends of the columns 21 are formed, and the columns 21 are attached to the side rails 11. A slide receiving metal fitting 30 is freely slidably fitted to the top rod 22, an S ring hook 40 is provided on the lower surface of the slide receiving metal fitting 30, and an upper limb training implement 50 is hung from the S ring hook 40. The upper limb training implement 50 is constituted of a pulley 51, a pulley rope 52, an S ring hook 53, a hanging belt 54 and a freely adjustable board 55.