PROBLEM TO BE SOLVED: To provide a stand-up assisting device capable of assisting a stand-up movement that is close to natural for a person in need of care for promoting independence of the person in need of care such as the elderly with weak legs and lower back, the injured, the sick, and the physically impaired.SOLUTION: The stand-up assisting device includes a support section for supporting the body of a person in need of care, and a drive mechanism for driving the support section. The stand-up assisting device draws a circular arc-shaped trajectory combining a circle and a straight line, which is a stand-up trajectory applying less burden to the person in need of care. Each trajectory is controlled by a single drive mechanism to miniaturize the device and reduce the weight, thereby becoming usable for the daily life in a general household.COPYRIGHT: (C)2014,JPO&INPIT【課題】足腰の弱った老人、けが人、病人及び身体障害者のような要介護者の自立を図るため、要介護者にとって自然に近い立ち上がり動作を補助することのできる立ち上がり補助装置を提供すること。【解決手段】要介護者の体を支持する支持部と、前記支持部を駆動する駆動機構を備え、要介護者にとって負担の少ない立ち上がり軌跡である円と直線を組み合わせた円弧の軌跡を描き、それぞれの軌跡を一つの駆動機構で制御することで小型・軽量化が可能となり、一般家庭等で日常生活に使用可能な立ち上がり補助装置。【選択図】図1