An electric toothbrush includes an electric toothbrush main body that includes a grip portion; a brush member that includes a brush; a motor that moves the brush; an actuator that relatively rotates the brush member with respect to the electric toothbrush main body in order to change an orientation of the brush; an acceleration sensor that detects an attitude of the main body; and a CPU that controls the actuator such that a brush angle becomes a predetermined optimum value based on the detected attitude.