The present invention relates to a thermoplastic resin composition and a molded article using same, the thermoplastic resin composition comprising: (D) 4 to 12 parts by weight of a methyl methacrylate-butadiene-styrene graft copolymer; (E) 0.1 to 0.3 parts by weight of a phosphate-based heat stabilizer; and (F) 25 to 35 parts by weight of an inorganic filler having an average particle diameter (D50) of 1 to 5 μm, with respect to 100 parts by weight of a basic resin including (A) 65 to 75 wt % of a polycarbonate, (B) 20 to 30 wt % of an aromatic vinyl-cyanized vinyl copolymer; and (C) 1 to 10 wt % of a polyethylene terephthalate resin.