An electroconductive polymer solution, comprising: a π-conjugated electroconductive polymer, being an organic polymer whose main chain is composed of a π-conjugated system, wherein the π-conjugated electroconductive polymer is one selected from the group consisting of polypyrroles, polythiophenes, polyacetylenes, polyphenylenes, polyphenylenevinylenes, polyanilines, polyacenes, polythiophenevinylenes, a solubilizable polymer which solubilizes the π-conjugated electroconductive organic polymer in an organic solvent, the solubilizable polymer comprising a polymer having an anion group, wherein the solubilizable polymer is one selected from the group consisting of a substituted or unsubstituted polyalkylene, a substituted or unsubstituted polyalkenylene, a substituted or unsubstituted polyimide, a substituted or unsubstituted polyamide, a substituted or unsubstituted polyester, or an electron attractive group, wherein the solubilizable polymer is one selected from the group consisting of polyacrylonitrile, polymethacrylonitrile, acrylonitrile-styrene resin, acrylonitrile-butadiene resin, acrylonitrile-butadiene-styrene resin, resin obtained by cyanoethylating a hydroxyl group or amino group-containing resin, polyvinyl pyrrolidone, alkylated polyvinyl pyrrolidone, and nitrocellulose, a phase transfer catalyst which is coordinated to an anion group or an electron attractive group of the solubilizable polymer, and an organic solvent, wherein a content of the phase transfer catalyst is within a range from 0.1 to 10 molar equivalents based on anion groups and electron attractive groups of the solubilizable polymer which does not contribute to doping of the π-conjugated electroconductive organic polymer. a π-conjugated electroconductive polymer, being an organic polymer whose main chain is composed of a π-conjugated system, wherein the π-conjugated electroconductive polymer is one selected from the group consisting of polypyrroles, polythiophenes, polyacetylenes, polyphenylenes, polyphenylenevinylenes, polyanilines, polyacenes, polythiophenevinylenes, a solubilizable polymer which solubilizes the π-conjugated electroconductive organic polymer in an organic solvent, the solubilizable polymer comprising a polymer having an anion group, wherein the solubilizable polymer is one selected from the group consisting of a substituted or unsubstituted polyalkylene, a substituted or unsubstituted polyalkenylene, a substituted or unsubstituted polyimide, a substituted or unsubstituted polyamide, a substituted or unsubstituted polyester, or an electron attractive group, wherein the solubilizable polymer is one selected from the group consisting of polyacrylonitrile, polymethacrylonitrile, acrylonitrile-styrene resin, acrylonitrile-butadiene resin, acrylonitrile-butadiene-styrene resin, resin obtained by cyanoethylating a hydroxyl group or amino group-containing resin, polyvinyl pyrrolidone, alkylated polyvinyl pyrrolidone, and nitrocellulose, a phase transfer catalyst which is coordinated to an anion group or an electron attractive group of the solubilizable polymer, and an organic solvent, wherein a content of the phase transfer catalyst is within a range from 0.1 to 10 molar equivalents based on anion groups and electron attractive groups of the solubilizable polymer which does not contribute to doping of the π-conjugated electroconductive organic polymer.