PROBLEM TO BE SOLVED: To provide an upper limb stretch exercise aid for facilitating an exercise to stretch an upper limb without reference to a place.SOLUTION: In an aid body 10 of an upper limb stretch exercise aid 1, the portion of a first enlarged diameter part 12 connected to one end of a center cylinder part 11 has a circular arcuate first curve surface 121 projecting in a direction approaching a shaft center CA of the center cylinder part 11. The portion of a second enlarged diameter part 13 connected to the other end of the center cylinder part 11 has a circular arcuate second curve surface 131 projecting in a direction approaching the shaft center CA of the center cylinder part 11. The curvature radius D121 of the first curve surface 121 is smaller than the curvature radius D131 of the second curve surface 131.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】場所を選ばす、容易に上肢を伸長する運動ができる上肢伸長運動補助具を提供すること。【解決手段】上肢伸長運動補助具1の補助具本体10の、中央筒部11の一端部に接続されている第1拡径部12の部分は、中央筒部11の軸心CAに近づく方向へ突出する円弧状の第1曲面121を有し、中央筒部11の他端部に接続されている第2拡径部13の部分は、中央筒部11の軸心CAに近づく方向へ突出する円弧状の第2曲面131を有する。第1曲面121の曲率半径D121は、第2曲面131の曲率半径D131よりも小さい。【選択図】図2