A component for grounding having conductivity includes a first face positioned opposite a first motor case having conductivity, a second face positioned opposite a second motor case having an insulating property and positioned opposite the first motor case, and a third face positioned opposite a plug having conductivity. The first and third faces and the second face are in a front-back relation in the component for grounding, and the first face and the third face are contiguous to each other for an electrical connection between the first motor case and the plug. The second motor case is provided with a connector couplable with the plug, and, on the second motor case, at least a part of the third face has a contact-avoiding shape.