A control circuit board is received in a circuit board receiving case without being directly joined to the circuit board receiving case and has a circuit board side connector. The circuit board side connector is installed to a main body side connector of a gear housing in an installation direction parallel to a rotatable shaft of the motor main body to supply electric power to the motor main body through the main body side connector. A pin main body of a fixing pin is received into a fixing through hole of the control circuit board through a pin receiving through hole of the gear housing in a direction perpendicular to the installation direction of the circuit board side connector.