A multi-articulated link knee joint includes: a knee unit in which an upper link member is structured to rotate relative to a lower link member by a multi-articulated link mechanism including a plurality of link members including the upper link member and the lower link member； a driven member to move in accordance with the rotation of the upper link member； a position detector for detecting the position of the driven member, the position detector provided at the lower link member； and an angle detector for obtaining the bending angle of the knee unit from the position of the driven member.
