A motorized balance board includes a gyrosensor. An arithmetic operation unit calculates a tilt angle change value based on a signal output from the gyrosensor. When the control mode is a standby mode, a control mode switch element switches the control mode to a riding mode when the absolute value of the tilt angle change value exceeds a riding angular velocity threshold. When the control mode is the riding mode, the control mode switch element switches the control mode to the standby mode when the absolute value of the tilt angle change value exceeds a descending angular velocity threshold.