A polyester resin that can be beneficially employed as one finding
application in deactivation of polycondensation catalysts for polyester
production and suppression of forming of acetaldehyde and other aldehydes
and cyclic ester oligomers at molding stage. In particular, there is
provided a polyester resin composed mainly of an aromatic dicarboxylic
acid component and a glycol component wherein a phosphorus compound is
incorporated through copolymerization or blending in an amount of 100 to
10,000 ppm in terms of phosphorus element, characterized in that the
contents of Zn element, Fe element, Ni element and Cr element are not
greater than specified values.