A rising motion assisting device (1) includes a support body (11) and a handrail plate (7) which is provided on the support body (11) and paralleled to a horizontal plane. The handrail plate (7) is movable in a predetermined movement direction on the horizontal plane. For example, a length of the handrail plate (7) in a direction orthogonal to the moving direction on the horizontal plane is longer than that in the moving direction. Besides, for example, the handrail plate (7) is further provided with a fixing mechanism which is utilized to fix the handrail plate (7) at a predetermined position on the way of movement of the handrail plate (7).起立動作輔助具（1），具備：支持體（11）；以及以在支持體（11）上平行於水平面的方式設置的扶手板（7）；扶手板（7），可在上述水平面內的既定移動方向上移動。例如，扶手板（7），比起移動方向的長度而言，在上述水平面內與移動方向正交的方向的長度更長。另外，例如，更具備將扶手板（7）固定在扶手板（7）的移動途中的既定位置上的固定機構。
