Abstract: A locomotion-command method for a mobile robot of the type having a master section and a locomotion module wherein a travelling route is specified by a command sent from the master section to the locomotion module and wherein travelling on a given direction line is set as a basic motion, and a travelling route can be arbitrarily set by sending a command which specifies changes in the position, direction and angle of the direction line, to thereby enable a robot to freely travel with simple commands and to realize effective control of the robot.