To provide a resin composition excellent in heat resistance, impact resistance and fluidity, and having a small dependence of impact resistance upon thickness.

This resin composition comprises (A) aromatic polycarbonate resin, (B) a hydrogenated styrenic elastomer, (C) a copolymer resin obtained from an aromatic vinyl monomer and a vinyl cyanide monomer and containing vinyl cyanide units in an average content of 2-15 wt.% and (D) poly(phenylene ether) resin. The component C consists of (a) 5-50 wt.% copolymer containing vinyl cyanide units in a content of 2-5 wt.%, (b) 5-50 wt.% copolymer containing vinyl cyanide units in a content of 5-10 wt.% and (c) 5-50 wt.% copolymer containing vinyl cyanide units in a content of 10-15 wt.%.