A lower band portion of a band shaped band wound around and fixed to the perimeter of the user's pelvis and a pair of end portions joined to the lower band portion, and an X-shaped stretchable intermediate band portion for pressing the user's lumbar region and joined to a pair of opposite ends of the intermediate band portion to be wound around the user's chest Equipped with a pair of upper band portions to be fixedThe pair of one end portions of the intermediate band portion are joined to the range of the front anterior position from the pelvis true position of the user in the lower band portion；The pair of upper band portions are separated from each other in a deployment state and extend in opposite directions and are wound around and fastened around the fifth to tenth ribs of the user's chest.
