Promoter for a polycondensation

A promoter for a polycondensation reaction, is used in conjunction with a catalyst in a polycondensation reaction, wherein the promoter for a polycondensation reaction a pyrogallol compound having a benzene ring, are replaced on the three mutually adjacent hydrogen atoms are replaced by hydroxyl groups includes, and a polycondensation resin by polycondensing raw material monomers is obtained using the promoter as defined above and of the catalyst. A polycondensation resin can be prepared together with a catalyst in a polycondensation reaction using the promoter of the present invention and the polycondensation resin can be used in various applications, including, for example films, sheets, fibers, toner materials for electrophotography and the like.