[Problem] The purpose of the present invention is to provide an automotive lamp extension molding comprising a resin composition which has a low specific gravity and an excellent balance between heat resistance and fluidability and can provide a molding having a surface having excellent gloss and brightness. [Solution] This automotive lamp extension molding comprises a resin composition which contains 50-95 mass% of a polyphenylene ether (A) and has a specific gravity of 1.00-1.12. The component (A) preferably has a reduced viscosity of 0.25-0.45 dl/g, and more preferably 0.25-0.38 dl/g (as measured at 30°C using a chloroform solvent).
