An object of the present invention is to provide a muscle strength assisting device that can appropriately perform muscle strength assisting for a wearer. A muscle strength assisting device (10) is a force for maintaining a first mounting device (20) and a second mounting device (30) that can be mounted on a body of a wearer (H) and a relative position of the first mounting device and the second mounting device. A force supply unit 40 that outputs at least one of a force for relatively moving the first wearing device and the second wearing device, and a control unit 50 that controls the force supplying unit according to a relative position of the first wearing device to the body. And [Selection diagram] Fig. 1【課題】着用者に対して適切な筋力補助を行うことができる筋力補助装置を提供する。【解決手段】筋力補助装置１０は、着用者Ｈの体に装着可能な第１装着具２０及び第２装着具３０と、第１装着具および第２装着具の相対位置を維持するための力並びに第１装着具および第２装着具を相対移動させるための力の少なくとも一方を出力する力供給部４０と、第１装着具の体に対する相対位置に応じて力供給部を制御する制御部５０と、を有する。【選択図】図１
