Biped ambulatory robot

A biped ambulatory robot, comprising an electrical storage device as a power supply for robot operation and two leg members, and which stands on a floor on a standing posture in which a knee joint in the middle portion of each of the leg members is bent further in the forward direction from the robot than in a vertically-erect posture in which each of the leg members is extended in the vertical direction, wherein:

• said electrical storage device is mounted in an electrical storage device unit provided on the torso of said robot, such that the center of gravity of said electrical storage device exists at a position further forward than the center of gravity of the robot without said electrical storage device in the vertically-erect posture, and the center of gravity of the robot with the electrical storage device thus mounted in the standing posture exists substantially directly above the knee joint of each of the leg members, as seen from one side of the robot, and wherein
• said electrical storage device is mounted in said electrical storage device unit such that said electrical storage device is installed and removed via an aperture provided in either the front surface or the rear surface of the torso of said robot.