A switch unit includes a switch cover having an opening; a knob for operating a switch, the knob being provided within the opening in such a manner as to oscillate or rotate; and a parting line is set on a circumferential edge portion of the opening of the switch cover. The switch cover includes a first resin layer which is molded of a resin material having a property in which a plate layer does not adhere thereto, in which the opening is formed and which defines a rear side of the switch cover; a second resin layer which is molded of a resin material having a property in which a plated layer can adhere thereto and which is provided on a surface side of the first resin layer in such a manner as to be integral with the first resin layer; and a plated layer which is provided to cover a surface of the second resin layer.