A method for producing a polycondensation polymer, which comprises: introducing a prepolymer of a polycondensation polymer into a polymerization reactor through a feed opening in a molten state; discharging the introduced prepolymer through holes of a perforated plate; and then polycondensing the prepolymer under reduced pressure, while allowing the prepolymer to fall along a support, wherein the perforated plate has two or more areas and polycondensation is performed by introducing a prepolymer and/or a polymer modifier into each of the areas and discharging the introduced prepolymer and/or polymer modifier through holes of each of the areas. 1-2, YURAKU-CHO, CHIYODA-KU, TOKYO 100-8440 JAPAN Japan ASAHI KASEI CHEMICALS CORPORATION 1201/KOLNP/2007 A 1201/KOLNP/2007 INDIA 2009-03-20T06:25:53Z 2007-07-20 2007-04-05 296456 2005-11-25 PCT/JP2005/021643 C08G 85/00 WO 2006/059536 YOKOYAMA, HIROSHI, AMINAKA, MUNEAKI 27343 0 195 Japan 2004-11-30 2004-345241 2007-07-20 0 3TNTYVV8 2009-04-30T18:36:49Z 38861 YOKOYAMA, HIROSHI, AMINAKA, MUNEAKI 1072 ASAHI KASEI CHEMICALS CORPORATION