PROBLEM TO BE SOLVED: To assist the extension motion of the waist when getting up from a forward bending posture while following the motion of the upper body even when including the motion of twisting the waist and the upper body to the left and right. SOLUTION: The cords are respectively provided along the multi-joint structure, one end is provided near one end of the multi-joint structure, and the other end is provided on the elastic member. . When the user is in the forward bending posture, the pair of multi-joint structures bends along the back, and when the multi-joint structure bends, the elastic members are deformed by being pulled by the cords, and the restoring force causes the elastic members to flex. Extend the joint structure. Further, the pair of multi-joint structures are provided substantially in parallel and separated from each other. [Selection diagram] Figure 1【課題】腰や上体を左右にひねる動作を含む場合においても、上体の動きに追従しつつ、前屈姿勢から起き上がるときの腰の伸展動作を補助することができる。【解決手段】索状体は、多関節構造体に沿ってそれぞれ設けられており、一方の端が多関節構造体の一方の端近傍に設けられ、他方の端は弾性部材に設けられている。使用者が前屈姿勢になると、一対の多関節構造体が背中に沿って屈曲し、多関節構造体が屈曲することで索状体に引っ張られて弾性部材が変形し、その復元力により多関節構造体を伸展させる。また、一対の多関節構造体は、略平行かつ離間して設けられている。【選択図】図１
