The present invention relates to a polyester resin composition and a molded article produced therefrom. The polyester resin composition includes: about 80 wt % to about 98 wt % of a polybutylene terephthalate resin; about 0.1 wt % to about 5 wt % of a carbodiimide-based compound; about 0.1 wt % to about 5 wt % of a nucleating agent; and about 0.5 wt % to about 15 wt % of an inorganic filler having a non-spherical or non-circular cross-section.