Thermoplastic resin composition and its molded articles

A thermoplastic resin composition comprising:

• a rubber-reinforced thermoplastic resin (A) obtained by graft polymerizing a monomeric mixture (b) comprising an aromatic vinyl compound, a vinyl cyanide compound and optionally other copolymerizable monomeric compound(s) in the presence of a rubber-like polymer (a), and
• a copolymer (B) obtained by polymerizing an aromatic vinyl compound, a vinyl cyanide compound and optionally other copolymerizable monomeric compound(s),
• the content of the rubber-like polymer (a) in the rubber-reinforced thermoplastic resin (A) being 10 to 25% by weight,
• the content of the vinyl cyanide monomeric unit in the acetone soluble matter being 15 to 40% by weight,
• the ratio of weight-average molecular weight Mw to number-average molecular weight Mn of said acetone soluble matter (Mw/Mn ratio) being 2 to 5, and
• the ratio of Z-average molecular weight MZ to number-average molecular weight Mn of said acetone soluble matter (MZ/Mn ratio) being 5 to 11.