A vehicle electric motor housing device comprises: a case housing an electric motor, a support member rotatably supporting a rotor shaft of the electric motor, and an insulating member insulating the case from the support member, the insulating member including an insulating layer and a protective layer, the protective layer being disposed between the insulating layer and at least one of the case and the support member facing the insulating layer, and the protective layer having higher strength than the insulating layer.