In a vehicle door mirror device, a base is attached to a door and covered with a base cover. A gasket is disposed on a door panel of the base cover, a seal portion of the gasket seals a gap between a lower side end of the base cover and the door panel. The seal portion is extended from the gasket toward the base cover side. Therefore, even if a dimension of the gap between the lower side end of the base cover and the door panel varies, the lower side end of the seal portion can be suppressed from being separated from an outer periphery of the base cover toward the inner side, the base cover can be suppressed from looking floating from the door panel, and appearance of the gap between the lower side end of the base cover and the door panel can be improved.