A resin composition is provided which comprises (A) 100 parts by weight of an ABS graft copolymer composed of an acrylonitrile compound and a vinyl aromatic compound in a weight ratio of 10:90 to 50:50, and (B) 5 to 30 parts by weight of an ethylene oxide copolymer admixed with the ABS graft copolymer and containing at least 50 wt. % of ethylene oxide, the ethylene oxide copolymer having a refractive index (nD²⁰) of at least 1.50. The composition, which has antistatic properties, is useful for injection molding to give moldings having an excellent surface appearance.