The body support device has a first support portion that is mounted on the back of the wearer's thigh so that one end is positioned in the vicinity of the wearer's buttocks and the other end is positioned in the vicinity of the wearer's knee. A second support portion mounted on the wearer's shin so that the other end is positioned near the wearer's foot, a grounding portion positioned near the wearer's foot, and a first support portion A first rotating part for connecting and rotating the other end of the second support part and one end of the second support part, and a second rotating part for connecting and rotating the other end of the second support part and the upper end of the grounding part, Is provided. The first rotation unit regulates the rotation in the direction in which the wearer's back of the thigh and the calf are approached by a predetermined angle, and the second rotation unit is in the direction in which the wearer's shin and the instep of the foot approach. The rotation is restricted at a predetermined angle, and the grounding unit is grounded to the grounding surface in a state where the rotation of at least the first turning unit or the second turning unit is restricted.体支持装置は、一端が装着者の臀部近傍に位置し、他端が装着者の膝近傍に位置するように、装着者の大腿裏に装着される第１支持部と、一端が装着者の膝近傍に位置し、他端が装着者の足近傍に位置するように、装着者の脛に装着される第２支持部と、装着者の足近傍に位置する接地部と、第１支持部の他端と第２支持部の一端とを連結して回動させる第１回動部と、第２支持部の他端と接地部上端とを連結して回動させる第２回動部とを備える。第１回動部は、装着者の大腿裏と脹脛とが近づく方向における回動を、所定の角度で規制し、第２回動部は、装着者の脛と足の甲とが近づく方向における回動を、所定の角度で規制し、接地部は、少なくとも第１回動部又は第２回動部の回動が規制された状態において、接地面に接地する。
