A molded component for the beam path of a radar apparatus with a low radio transmission loss and improved hardness and abrasion resistance is provided. The molded component for the beam path of a radar apparatus comprises a base body 21 composed of a cyclic polyolefin resin layer, and a bright decoration layer 24 disposed on the surface of the base body. Preferably, by disposing a modified layer 22 treated by plasma ion etching and/or highly concentrated ozone water especially on the surface of the cyclic polyolefin resin, wettability on the surface is improved, thereby substantially improving the adhesion to the bright decoration layer.