PURPOSE: To obtain the subject composition capable of preventing the foaming from occurring in melt kneading a polycarbonate resin with a polyamide resin, solving problems in thermal stability and eliminating the reduction in molecular weight by blending a specific copolymer with a resin composition comprising the polycarbonate resin and the polyamide resin.

CONSTITUTION: This composition is obtained by blending (A) 100 pts.wt. resin composition comprising a polycarbonate resin and a polyamide resin at a blending weight ratio of (1/9)-(9/1) with (B) 1-50 pts.wt., preferably 1-30 pts.wt. copolymer made by copolymerizing (i) an aromatic vinylic monomer (e.g. styrene) and (ii) a (meth)acrylic ester containing hydroxyl group (e.g. 2-hydroxyethyl acrylate) and/or an α,β-unsaturated carboxylic acid [e.g. (meth)acrylic acid].