Coating method for producing a conductive polymer

To provide a method for producing conductive polymer film suitable for, for example, enhancing electrical conductivity of a PEDOT/PSS film capable of being manufactured quickly and at low cost with simple operation, enhancing electrical conductivity of PEDOT/PSS film significantly, and obtaining stable properties of the film. Means for Solving Problem A method of producing a conductive polymer film by drying out a solution 2 of conductive polymer and a dopant solution thereof to obtain a dried film A dried film 9 obtained from the solution 2 is treated with an organic solvent 11 and pressurized carbon dioxide through a reaction vessel 10.