Selective laser sintering (SLS) is starting to be used for producing not only prototypes but also final products. Especially, if an SLS product is to be uses as a final product, it may need flame-retardant properties. Some characteristics (i.e., crystallization, mechanical properties, and flame retardancy) of flame-retardanant(FR) coplymer poly(butylene terephthalate) (cPBT) was investigated. As FR materials, poly(pentabromobenzyl acrylate) (PPBBA) (with bromine content of 71 %) and brominated bisphenol A-type epoxy resin (with bromine content of 52 %) were used and compared in terms of the above-mentioned characteristics. It was revealed that the crystallization characteristics of the powder cPBT differ according to the combination of FR type and FR promoter, antimony trioxide (ATO). In particular, as for PPBBA (with high bromine content), the nucleating-agent effect of ATO on cPBT was suppressed, whereas the brominated bisphenol A-type epoxy (with low bromine content) did not suppress the nucleating-agent effect. It was also revealed that SLS specimens formed with 10 wt% PPBBA and 5 wt% ATO and those formed with 15 wt% brominated bisphenol A-type epoxy and 5 wt% ATO and thicknesses of 3, 2, and 1 mm could attain V0 grade in the UL 94 test.