Polyester resin, molded product made thereof and process for production of polyester resin

A process for producing a polyester resin, which comprises polycondensing a dicarboxylic acid component containing an aromatic dicarboxylic acid or its ester-forming derivative as the main component and a diol component containing ethylene glycol as the main component, characterized in that a catalyst is added to the reaction system so that the following respective atoms derived from the catalyst will be contained in the following concentration ranges based on the obtainable polyester resin:

• 0<T≦50 ppm10≦Sb≦250 ppm0.1≦P≦200 ppm6.0≦Sb/P≦30
• (in the above formulae, T is the total concentration (ppm) of at least one type of atoms selected from the group consisting of titanium atoms, hafnium atoms and zirconium atoms in the resin, Sb is the concentration (ppm) of antimony atoms in the resin, and P is the concentration (ppm) of phosphorus atoms in the resin).