PROBLEM TO BE SOLVED: To efficiently transmit driving force of a drive source to a user, when the drive source of a drive mechanism of a lumbar part assist device is operated.SOLUTION: A lumbar part assist device includes: an upper body support part 20 for supporting an upper body of a user an inferior limb fitting part 40 to be fitted to an inferior limb of the user joint parts 45A and 45B for rotatably linking a back fitting part 10 with the inferior limb fitting part 40 in a direction corresponding to an anteflexion movement of the user a waist part fitting part 30 for fixing the joint parts 45A and 45B to a waist part lateral side of the human body and a drive mechanism 50 for applying force that raises the upper body of the user bending forward in an operating state, to the back fitting part 10 and the upper body support part 20. In the lumbar part assist device, an attachment part includes: a positional adjustment mechanism for moving an attachment position of the upper body support part 20 relative to the back fitting part 10 in a vertical direction according to an anteflexion degree of the user in an upper body anteflexion movement process and an anteversion angle adjustment mechanism for changing an attachment anteversion angle of the upper body support part 20 relative to the back fitting part 10.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】腰部補助装置の駆動機構の駆動源を作動させたときに、駆動源の駆動力が効果的に利用者へ伝達されるようにすること。【解決手段】利用者の上体を支持する上体支持部20と、利用者の下肢に装着される下肢装着部30と、前記背中装着部10と前記下肢装着部20とを利用者の前屈動作に対応する方向へ回転可能に連結する関節部45A,45Bと、この関節部45A,45Bを人体の腰部側方へ固定する腰部装着部40と、作動状態において前屈した利用者の上体を起こすような力を背中装着部10および上体支持部20へ作用させる駆動機構50を備えた腰部補助装置において、取付け部は、利用者の上体前屈動作過程の前屈度合に対応して、前記背中装着部10に対する前記上体支持部20の取付け位置が上下方向へ移動する位置調整機構、と、前記背中装着部10に対する前記上体支持部20の取付け前傾角度が変化する前傾角度調整機構を備えている。【選択図】図1
