Abstract: An artificial leg capable of functioning as an “intelligent artificial leg” is and having a knee joint bearing member and stopper to which only a small moment is applied on the lower leg frame when the leg is standing or the knee is bent, and the lower leg frame has a uniform thickness and is lightweight yet with no loss of strength, and further the protuberances of the inner and outer circumferential surfaces of the the lower leg frame are small and, the empty space within the the lower leg frame has been widened. A rotating stopper 5 for standing, a rotating stopper 6 for bending the knee and a knee joint bearing member 4 are formed integrally within the the artificial leg and a knee joint bearing member 4 is embedded within said lower leg frame 1.