PROBLEM TO BE SOLVED: To reduce the weight of a tension spring. In addition, the weight of the human body support device will be reduced and the configuration will be simplified. SOLUTION: A tension spring 20 has a wire locking portion 20B into which a load is input and a closed space in which a gas is sealed, and the wire locking portion is pulled so that the dimensions in the tension direction are increased. As it is increased, the dimension in the direction orthogonal to the tensile direction is reduced, and as a result, the volume in the closed space is reduced, and the gas in the closed space is compressed, so that the restoring force in the direction opposite to the tensile direction is obtained. The elastic tube 44 is provided in the wire locking portion 20B. Further, the lumbar support device 10 is provided between the thigh arm 16 and the upper body side frame 18 worn by the user and the thigh arm 16 and the upper body side frame 18, and the upper body side frame 18 is provided with respect to the thigh arm 16. It includes a tension spring 20 that is pulled by being displaced to one side. [Selection diagram] Fig. 2【課題】引張バネの軽量化を図る。また、人体サポート装置の軽量化及び構成の簡素化を図る。【解決手段】引張バネ２０は、荷重が入力されるワイヤ係止部２０Ｂと、内部にガスが封入される密閉空間を有し、ワイヤ係止部が引張られることで該引張方向への寸法が増加されると共に引張方向と直交する方向への寸法が減少され、結果として密閉空間内の体積が減少され、当該密閉空間内のガスが圧縮されることで引張方向とは反対方向への復元力をワイヤ係止部２０Ｂに生じさせる弾性チューブ４４と、を備えている。また、腰部サポート装置１０は、使用者に装着される大腿アーム１６及び上体側フレーム１８と、大腿アーム１６と上体側フレーム１８との間に設けられ、上体側フレーム１８が大腿アーム１６に対して一方側へ変位されることで引張られる引張バネ２０と、を備えている。【選択図】図２
