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A polytrimethylene terephthalate resin which comprises 90 to 100 mole % of a trimethylene terephthalate recurring unit and 0 to 10 mole % of at least one monomer unit derived from a monomer which is different from the monomer used for forming said recurring unit and is copolymerizable with at least one monomer used for forming VDLGUHFXUULQJXQLWDQGH[KLELWV$DOLPLWLQJYLVFRVLW\>@RIWR4.0 dl/g, (B) a molecular weight distribution (Mw/Mn) of 2.0 to 2.7, (C) a brightness index L value (L-1) of 70 to 100 and a chromaticness index b* value (b*-1) of -5 to 25, and (D) , after the heat treatment at 180°C for 24 hours in an air atmosphere, a L value (L-2) of 70 to 100 and b* value (b*-2) of -5 to 25. (FIG. - 1)