PROBLEM TO BE SOLVED: To provide a leg support device that automatically adjusts a torque generated by oscillation exercise by automatically adjusting rigidity of joints for the oscillation exercise, and to thereby make reduction possible for power consumption or a users burden.SOLUTION: The leg support device includes: a waist side installation part 2 that is installed on the waist side part of a user a first oscillation arm 13 that is arranged to the side of the users thigh and that has on top a recessed shape or a projected shape formed which becomes the oscillation axis a thigh installation part 19 that is attached to the first oscillation arm and that is applied to the users thigh a driving shaft member 6 that supports the recessed shape or the projected shape which becomes the oscillation axis of the first oscillation arm and that freely rockingly support the first oscillation arm for the waist installation part variable rigidity means that makes rigidity variable which is a force required for oscillating the first oscillation arm and control means for controlling the variable rigidity means. The variable rigidity means is composed of a spiral spring 24, a spring fixing member 23, and rigidity adjustment turning means 21.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】揺動運動する関節の剛性を自動的に調整することで揺動運動によって発生するトルクを自動的に調整し、消費電力あるいはユーザの負荷をより低減することができる、脚力支援装置を提供する。【解決手段】利用者の腰側部に装着される腰側装着部2と、利用者の大腿の側方に配置されて上部に揺動の軸となる凹形状あるいは凸形状が形成された第1揺動アーム13と、第1揺動アームに取り付けられて利用者の大腿にあてがわれる大腿装着部19と、第1揺動アームの揺動の軸となる凹形状あるいは凸形状を支持して腰側装着部に対して第1揺動アームを揺動自在に支持する駆動軸部材6と、第1揺動アームを揺動させるために必要とする力である剛性を可変とする剛性可変手段と、剛性可変手段を制御する制御手段と、を備え、剛性可変手段はゼンマイバネ24とバネ固定部材23と剛性調整旋回手段21にて構成されている。【選択図】図1
