Abstract: A thermoplastic resin composition which comprises 1 to 98 parts by weight of polyolefin (A), 1 to 49 parts by weight of modified polyolefin (B) obtained by reacting a polyolefin with an unsaturated carboxylic acid or a derivative thereof, 1 to 98 parts by weight of polyamide (C) [provided that (A)+(B)+(C)=100 parts by weight], 5 to 50 parts by weight of modified ethylene-.alpha.-olefin copolymer (D) obtained by reacting a low-crystalline ethylene-.alpha.-olefin copolymer with an unsaturated carboxylic acid or its derivative, and a metal compound (E) in an amount of 0.5 to 5 times the molar quantity of the acid added to said component (B) and said component (D).The thermoplastic resin composition is preferably used for producing products excellent in both impact resistance and surface luster.