Laser transmissive resin molded product and composite molded product thereof

Disclosed is a laser-transmitting resin molded article which comprises a polyester resin as a base material and has both of a laser-weldable property (a laser-transmitting property) and flame retardancy at high levels. The molded article is formed from a resin composition comprising a polyester resin (A) (e.g., a PBT resin), at least one bromine-containing compound (B) selected from a brominated (meth)acrylate resin, a brominated styrene resin, a brominated polycarbonate resin and a brominated epoxy resin, and an antimony oxide (C) having an average particle diameter of 2 to 10 µm. The molded article has an excellent laser-transmitting property and excellent flame retardancy, and may have a laser beam transmissivity of 20% or more as measured at a thickness of 1 mm and a flame retardancy evaluation rating of V-0 as measured in accordance with UL94 standard at a thickness of 0.8 mm. The resin composition may further comprise a filler, a fluorine-containing resin, a polycarbonate resin, a phosphorus compound and/or a crystallization nucleating agent.