To achieve suction, adsorption or the like by a suction device without giving a sense of incongruity to a human body, easily conduct cupping treatment methods, etc., reinforce a part of a surface or back of the suction device, or change its thickness, strengthen or weaken suction force by changing a ratio or position of this reinforced or thickened part, and change the size of it to be larger or smaller by suction for enabling different applications.

The side of a reinforced or thickened part 3 has a stronger elasticity than the side of a non-reinforced or non-thickened part 4, a part 5 to be sucked on the side of the non-reinforced or non-thickened part 4 is sucked to the side of a sucked part 6 of the reinforced or thickened part 3, and a function of the part where this device is applied or around the part can be improved by suction force, so this can be used to the back part or lower back part of a human body in a direction where skin need be pulled in accordance with sublaxation or the like of backbones, thereby it can be applied to hips, busts, etc., to change their shape to achieve cupping treatment methods or the like.