A polycarbonate resin composition which comprises(i) bisphenol type aromatic polycarbonate, in admixture with(ii) 5 to 200 parts by weight of a polyester type copolymer, per 100 parts by weight of said bisphenol type aromatic polycarbonate, which is produced by adding(a) 5 to 100 parts by weight of bisphenol type aromatic polycarbonate having a viscosity-average molecular weight of not less than 5,000,to (b) 100 parts by weight of a polyester precursor having a number-average polymerization degree of 1 to 30 which is obtained from bifunctional carboxylic acid mainly composed of terephthalic acid or a derivative thereof having an ester forming ability and a diol component, and effecting polycondensation, which provides an improved fluidity and solvent cracking resistance without remarkably decreasing of the original impact resistance and transparency of polycarbonate, to eliminate the defects of polycarbonate.