FLAME RETARDANT POLYESTER RESIN COMPOSITION AND MOLDED ARTICLE COMPRISING SAME

The present invention is a flame retardant polyester resin composition from which a molded article having excellent heat resistance, little warpage deformation and good molded article appearance and having high strength/high rigidity and flame retardance that are compatible with each other can be obtained and which is excellent in residence stability; and is a flame retardant polyester resin composition that contains 3 to 74% by mass of a polybutylene terephthalate resin (A), 3 to 60% by mass of a polyethylene terephthalate resin (B1), 3 to 50% by mass of a copolyester resin (B2), 10 to 50% by mass of a halogen-free flame retardant (C), and 10 to 40% by mass of a glass fiber (D), wherein the copolyester resin (B2) is a polyester resin obtained by copolymerizing an ethylene terephthalate unit with at least one selected from the group consisting of neopentyl glycol, 1,2-propanediol, diethylene glycol, 1,4-cyclohexanedimethanol, and isophthalic acid, and that satisfies prescribed characteristics.