Polybutylene terephthalate resin composition and injection molded articles

Provided are a polybutylene terephthalate resin composition having sufficient fluidity to be molded as thin-walled during molding and having excellent flame retardancy even when molded as thin-walled, and an injection-molded article obtained using this resin composition. A polybutylene terephthalate resin composition containing 20 to 65 total parts by mass of (B) brominated epoxy flame retardant and/or brominated acrylate flame retardant, 10 to 30 parts by mass of (C) antimony flame retardant auxiliary, 3 to 15 parts by mass of (D) talc, and 1 to 10 parts by mass of (E) polyvalent hydroxyl group-containing compound having a hydroxyl value of 100 or higher per 100 parts by mass of (A) polybutylene terephthalate resin having an intrinsic viscosity of 0.70 to 1.00 g/dL; and an injection-molded article having a 0.2 to 0.5-mm-thick thin-walled portion in at least one portion obtained by injection-molding this resin composition.