To facilitate a procedure by a chiropractor.

A practitioner of chiropractic puts the legs on step boards 81 and 82 of a foot controller 80 and performs an operation of swinging the step boards 81 and 82. When the step board 81 moves in the direction of downward inclining a front part of a swinging shaft, a drive part 71 moves a femoral-area contact part 50L in a direction of spreading an angle θ2. When the step board 81 moves in the direction of downward inclining a rear part of the swinging shaft, the drive part 71 moves the femoral-area contact part 50L in a direction of narrowing the angle θ2. When the step board 82 moves in the direction of downward inclining a front part of the swinging shaft, a drive part 72 moves a femoral-area contact part 50R in a direction of spreading an angle θ3. When the step board 82 moves in the direction of downward inclining the rear part of the swinging shaft, the drive part 72 moves the femoral-area contact part 50R in a direction of narrowing the angle θ3.