The body support device according to the present invention is provided with a first support part mounted to a thigh back of a wearer so that one end of the first support part is positioned in the vicinity of the buttocks of the wearer and the other end is positioned in the vicinity of a knee of the wearer, a second support part mounted to a shin of the wearer so that one end of the second support part is positioned in the vicinity of the knee of the wearer and the other end is positioned near a foot of the wearer, a ground part positioned in the vicinity of the foot of the wearer, a first rotation part for connecting and rotating the other end of the first support part and the one end of the second support part, and a second rotation part for connecting and rotating the other end of the second support part and a top end of the ground part. The first rotation part restricts rotation in the direction in which the thigh back and a calf of the wearer approach each other to a predetermined angle, the second rotation part restricts rotation in the direction in which the knee and an instep of the wearer approach each other to a predetermined angle, and the ground part contacts the ground surface in a state in which rotation of at least the first rotation part or the second rotation part is restricted.本發明之身體支撐裝置具備：第1支撐部，其以一端位於被安裝者之臀部附近、另一端位於被安裝者之膝部附近之方式安裝於被安裝者之大腿後側；第2支撐部，其以一端位於被安裝者之膝部附近、另一端位於被安裝者之足部附近之方式安裝於被安裝者之小腿；接地部，其位於被安裝者之足部附近；第1轉動部，其使第1支撐部之另一端與第2支撐部之一端連結並轉動；及第2轉動部，其使第2支撐部之另一端與接地部上端連結並轉動。第1轉動部以特定之角度規制被安裝者之大腿後側與小腿肚靠近的方向之轉動，第2轉動部以特定之角度規制被安裝者之小腿與腳背靠近的方向之轉動，接地部在至少第1轉動部或第2轉動部之轉動受規制之狀態下與接地面接地。
