There is disclosed a polyamide resin composition containing: (A) 85 to 95 parts by weight of a polyamide resin; (B) 5 to 15 parts by weight of wollastonite; (C) 3 to 10 parts by weight, to 100 parts by the total weight of ingredients (A) and (B), of a styrene copolymer modified with at least one modifier selected from the group consisting of unsaturated carboxylic acids and unsaturated dicarboxylic anhydrides; and (D) 0.5 to 5 parts by weight, to 100 parts by the total weight of ingredients (A) and (B), of a high-density polyethylene modified with at least one modifier selected from the group consisting of unsaturated carboxylic acids and unsaturated dicarboxylic anhydrides, the high-density polyethylene having a weight-average molecular weight of 50,000 to 400,000.