To provide a reflector in which heat resistance and durability under conditions of high temperature and high humidity are maintained while reducing the weight of a vehicle, and which is superior in surface smoothness.

A resin composition is obtained by blending (B) alicyclic structure-containing polymer, (C) crystalline olefin-based polymer having the melting point of 180C or less, and (D) compatibilizer with (A) crystalline polymer having the melting point of 200C or more. The reflector of a vehicle lighting fixture is molded using the resin composition in which the weight ratio between (A) crystalline polymer having the melting point of 200C or more and (B) alicyclic structure-containing polymer is 10/90 to 40/60, (C) crystalline olefin-based polymer having the melting point of 180C or less is in a range of 0.1 to 5 times with respect to (A) the crystalline polymer having the melting point of 200C or more, and the content of compatibilizer is 1 to 20 wt.% against the summated amount of (A) the crystalline polymer having the melting point of 200C or more, (B) the alicyclic structure-containing polymer, and (C) the crystalline olefin-based polymer.