A motorized balance board includes a wheel rotation angle detecting sensor, a gyrosensor, and an acceleration sensor. An arithmetic operation unit calculates a rotation angle change value, a rotation angle value, a tilt angle change value, and a tilt angle value, based on signals output from the wheel rotation angle detecting sensor, the gyrosensor, and the acceleration sensor. When the control mode is a riding mode, a control mode switch element switches the control mode to a standby mode based on the rotation angle change value, the rotation angle value, the tilt angle change value, and the tilt angle value.