To obtain a walking robot which walks with four legs, works with arm portions, consumes less electric power, and continues moving even if a driving actuator is broken.

Two leg portions of four leg portions are provided with working manipulators, and the walking robot is moved by using four leg portions when moved. The robot is constituted to work by using at least one leg portion of two leg portions provided with the working manipulators when working. The actuator is provided with a braking means, and when the robot does not walk, the attitude is maintained without conducting electricity to realize small power consumption. Further, the actuator is formed of a plurality of motors and is efficiently driven.