(EN) A thermoplastic resin composition excellent in transparency and capable of giving molded articles which are excellent in impact resistance and fabrication quality even when they have thin walls. The thermoplastic resin composition comprises a rubber-modified styrene resin composition comprising 60 to 80 % by mass of a continuous phase made of a styrene/(meth)acrylate copolymer and 40 to 20 % by mass of a dispersed phase made of a graft copolymer obtained by grafting a rubbery elastomer with a styrene/(meth)acrylate copolymer wherein the volume-mean particle diameter of the dispersed phase is 0.3 to 0.6 μm and the weight-average molecular weight (Mw) of the continuous phase and the constituent monomer units thereof satisfy a specific relationship and is characterized by containing 0.005 to 0.05 part by mass of an organopolysiloxane and, if necessary, 0.1 to 2.5 parts by mass of an ester lubricant per 100 parts by mass of the rubber-modified styrene resin composition.