A terminal modified polybutylene terephthalate resin has a weight average molecular weight Mw of 10,000 to 100,000, a melting point of 210° C. to 235° C., and a melt viscosity μ at 250° C. of not more than 10 Pa·s, and includes 90 to 300 mol/ton of a compound having a (poly)oxyalkylene structure, the compound being terminally bound in the resin, wherein the weight average molecular weight Mw represents a relative weight average molecular weight with respect to the molecular weight of a standard poly(methyl methacrylate) as determined by gel permeation chromatography using hexafluoroisopropanol (supplemented with 0.005 N sodium trifluoroacetate) as a mobile phase.