A prosthetic ankle joint (10) consists of a base (16) which includes an upper base portion and a lower base portion. The lower base portion is formed with a substantially hollow receiving cavity extending inwardly from an end thereof remote from the upper base portion. A base member is movably positioned within the receiving cavity and is connected to a prosthetic foot (12). The base member (60) is movable in side-to-side direction independently of the base, so as to enable the prosthetic foot (12) to closely follow a walking surface. The motion of the base member (60) is controlled by resilient biasing members positioned between the inner cavity and the base member (60).