The present invention relates to a thermoplastic resin composition comprising 20 to 60 parts by weight of a rubber-reinforced resin (A) and 80 to 40 parts by weight of an aromatic polycarbonate (B) having an average molecular weight of 16,000 to 30,000 ((A)+(B)=100 parts by weight), said rubber-reinforced resin (A) containing a grafted rubber-like polymer (A1) obtained by polymerizing at least one compound (b) selected from the group consisting of aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic ester compounds, acid anhydride monomeric compounds and maleimide-based compounds in the presence of a rubber-like polymer (a) having a glass transition temperature of not more than −40° C., the content of the rubber-like polymer (a) in the rubber-reinforced resin (A) being 10 to 70% by weight, and the grafted rubber-like polymer (A1) having such a particle size distribution that the weight percentage of the particles having a size of not less than 80 nm and less than 200 nm is not less than 30%, the weight percentage of the particles having a size of not less than 200 nm and less than 350 nm is not more than 70%, and the weight percentage of the particles having a size of not less than 350 nm is not more than 15%.