A waist fastening member 30 to be attached to the waist of the wearer 12, a right leg assisting part 54 provided downward from the right side of the waist fastening member 30, operating the auxiliary mounting frame 18A is, from the left side of the waist fastening member 30 I and a left leg auxiliary part 55 which is provided below. On the back side of the waist fastening member 30, the fitting portion 31 in close contact to eliminate the gap between the back side waist of the wearer 12 is attached. Fitting portion 31 is made of a bag-shaped member made of resin that is formed in a curved shape to cover the back side of the waist of the wearer 12. While the atmospheric pressure is the internal pressure, it is a deformable liquid state until it is attached to the wearer 12, the fitting portion 31, the waist of the wearer 12 is depressurized to an internal pressure after being attached to the wearer 12 I want to change the shape corresponding to the body shape of the part in contact with the back side.動作補助装着フレーム18Aは、装着者12の腰に装着される腰締結部材30と、腰締結部材30の右側部から下方に設けられた右脚補助部54と、腰締結部材30の左側部から下方に設けられた左脚補助部55とを有する。腰締結部材30の背面側には、装着者12の腰背面側との隙間をなくして密着するフィッティング部31が取り付けられている。フィッティング部31は、装着者12の腰の背面側を覆うように湾曲した形状に形成された樹脂製の袋状部材からなる。フィッティング部31は、内部圧力が大気圧である状態で、装着者12に装着されるまで変形可能な流動状態であり、装着者12に装着された後に内部圧力を減圧されて装着者12の腰背面側に当接する部分の体形に応じた形状に変化する。
