To provide a leg muscles and joints training device, in which a person having the feet and the waist weakened or in the fed for a long time can perform exercises for the muscles of legs or joints of ankles or knees while lying or sitting on a chair by using the motive force of a motor and doing knee bends almost naturally without fixing the feet.

Rotary belts 13a and 13b are parallel provided on the upper face side of a pedestal formed almost in the shape of plate, these rotary belts 13a and 13b are connected through bevel gears 22a, 22b and 22c to a motor 20 to be oppositely rotated, movable plates 14a and 14b are respectively attached on both the rotary belts 13a and 13b, footrests 16a and 16b are attached through hinges 15 onto these movable plates 14a and 14b, and these footrests 16a and 16b and the movable plates 14a and 14b are linked through gas dampers 30 to be freely turnably.