A method for transporting a large-scale polygonal prism by a small robot is proposed. To achieve the operation by a small robot, a new motion control considering the limitation of manipulation area and the sensing devices is required. Tumbling operation is one of good transporting method for controlling a large-scale or heavy object. We implement a balance control technique with the weight of the robot to the object rotation. The proposed method is implemented to a small robot "ASTERISK" and the effectiveness is confirmed.