The present invention provides a controlling undergarment covering a wearer's abdomen, lumbar, and thigh capable of stabilizing the pelvis, tightening the swelling of the center of the abdomen, and performing a correction to stabilize the lower buttocks without discomfort and the need for putting on and taking off when excreting which comprises: a main body for covering the wearer's abdomen, lumbar, and thigh composed by the connection of a front part, a back part, and two leg parts; and a belt with stretchability for surrounding the front and back sides of the main body wherein a crotch region is open.