To manipulate the pelvis safely and properly by pressing the coccyx utilizing the patients own body weight. [Solution] A coccyx-contacting therapeutic part (9a) is disposed inside a cylindrical casing (7) so as to be movable in the vertical direction via an elastic body (10). The upper end thereof is provided with a coccyx-contacting cushion (11) configured from a sponge, etc. The patient straddles the coccyx-contacting cushion (11), assuming a posture as if to sit thereon, and places the coccyx on the coccyx-contacting cushion (11). In said posture, both feet are slightly raised from the floor to apply the body weight on the coccyx-contacting cushion (11) and press the coccyx upward from below. When doing so, the patient continues to maintain an upright posture by pressing the upper half of the body against a posture-maintaining structure (2) and grasping the grips with both hands.