To provide a means for efficiently producing a high quality polycondensation resin without hindrance such as fusion of lower condensates to each other or scaling in piping by a lower condensate.

The method for producing a polycondensation resin includes a step of performing solid phase polymerization of a lower condensate, and the method for producing a polycondensation resin further includes a step of producing a lower condensate, a step of compression-molding the obtained lower condensate to form a granular compression-molded product, and a step of performing solid phase polymerization of the granular compression-molded product.