To provide an elbow/knee joint assistance device capable of restricting the movement of connecting members and preventing the connecting members from hanging down. This elbow/knee joint assistance device is characterized in that a one-side connecting member 31 and an other-side connecting member 32 are positioned at an elbow or knee joint； one end of the one-side connecting member 31 is pivotably connected to an other-side end part 31b of a one-side inner arm 10b, and the other end thereof is pivotably connected to an other-side end part 31a of a one-side outer arm 10a； one end of the other-side connecting member 32 is pivotably connected to a one-side end part 32b of an other-side inner arm 20b, and the other end thereof is pivotably connected to a one-side end part 32a of an other-side outer arm 20a； and a center part of the one-side connecting member 31 and a center part of the other-side connecting member 32 are restrained by a connection restraint member 33.本發明之課題在於提供一種可限制連結構件的動作並可防止連結構件下垂之膝肘關節輔助裝置。 本發明之解決手段的特徵為：將一方連結構件(31)與另一方連結構件(32)配置在膝肘關節；一方連結構件(31)，是將一端轉動自如地連接於一方內臂(10b)的另一端部(31b)，並將另一端轉動自如地連接於一方外臂(10a)的另一端部(31a)；另一方連結構件(32)，是將一端轉動自如地連接於另一方內臂(20b)的一端部(32b)，並將另一端轉動自如地連接於另一方外臂(20a)的一端部(32a)；以連結拘束構件(33)來拘束一方連結構件(31)的中央部與另一方連結構件(32)的中央部。
