ROBOT

A robot is provided. When a value obtained by excluding a gravitational component from an acceleration detected by an acceleration sensor is continuously less than a reference value for a certain time, a travelling state of the robot is determined as frictional surface travelling. A control circuit calculates an attitude angle of the robot from an angular velocity in a pitch direction, which is detected by an angular velocity sensor. When the calculated attitude angle is a lower limit angle or more for a determination time, the control circuit sets the attitude angle at the end of the determination time as an attitude control angle. When the travelling state of the robot is determined as the frictional surface travelling, the control circuit moves a counterweight frontward by a movement amount corresponding to the attitude control angle.