Disclosed is a compliant joint achieving passive compliance. The compliant joint includes a housing and a rotating member mutually rotatably provided; and a cam provided between the housing and the rotating member, and connected to the housing and the rotating member respectively. The cam is connected to the rotating member to rotate together with the rotation of the rotating member, or be independent of the rotating member so as to move in the axial direction of the rotating member separately from the rotating member. The cam is connected to the housing such that the cam can maintain the connection with the housing when external force below a designated value is applied to the rotating member, and release the connection with the housing in the case that external force more than the designated value is applied to the rotating member.