A method for producing a conductive polymer-containing dispersion, comprising: a manufacturing step of seed particles converted into a colloid protected by a polyanion, wherein an ethylenically unsaturated monomer is polymerized in a polyanion-containing dispersion medium, and a polymerization step of polymerizing a monomer for obtaining a conjugated conductive polymer in a dispersion medium including the monomer and the seed particles converted into the colloid protected by the polyanion, wherein: the dispersion medium of the manufacturing step is water or a mixed solvent of water and a water soluble solvent, the amount of the ethylenically unsaturated monomer used with respect to 100 parts by mass of the amount of the polyanion used in the manufacturing step is 20 parts by mass to 90 parts by mass, the polyanion is a polymer having a sulfonic group or a salt thereof, wherein the polymer having a sulfonic group is selected from a polyvinyl sulfonic acid, a polystyrene sulfonic acid, a polyallyl sulfonic acid, a polyacrylic ethyl sulfonic acid, a polyacrylic butyl sulfonic acid, a poly(2-acrylamide-2-methylpropane sulfonic acid) and a polyisoprene sulfonic acid, the monomer for obtaining a conjugated conductive polymer is thiophene which may have a substituent group, the dispersion medium of the polymerization step is water or a mixed solvent of water and a water soluble solvent, and the polymerization is performed by using at least one oxidation agent selected from a peroxodisulfuric acid and a salt thereof. a manufacturing step of seed particles converted into a colloid protected by a polyanion, wherein an ethylenically unsaturated monomer is polymerized in a polyanion-containing dispersion medium, and a polymerization step of polymerizing a monomer for obtaining a conjugated conductive polymer in a dispersion medium including the monomer and the seed particles converted into the colloid protected by the polyanion, wherein: the dispersion medium of the manufacturing step is water or a mixed solvent of water and a water soluble solvent, the amount of the ethylenically unsaturated monomer used with respect to 100 parts by mass of the amount of the polyanion used in the manufacturing step is 20 parts by mass to 90 parts by mass, the polyanion is a polymer having a sulfonic group or a salt thereof, wherein the polymer having a sulfonic group is selected from a polyvinyl sulfonic acid, a polystyrene sulfonic acid, a polyallyl sulfonic acid, a polyacrylic ethyl sulfonic acid, a polyacrylic butyl sulfonic acid, a poly(2-acrylamide-2-methylpropane sulfonic acid) and a polyisoprene sulfonic acid, the monomer for obtaining a conjugated conductive polymer is thiophene which may have a substituent group, the dispersion medium of the polymerization step is water or a mixed solvent of water and a water soluble solvent, and the polymerization is performed by using at least one oxidation agent selected from a peroxodisulfuric acid and a salt thereof. the dispersion medium of the manufacturing step is water or a mixed solvent of water and a water soluble solvent, the amount of the ethylenically unsaturated monomer used with respect to 100 parts by mass of the amount of the polyanion used in the manufacturing step is 20 parts by mass to 90 parts by mass, the polyanion is a polymer having a sulfonic group or a salt thereof, wherein the polymer having a sulfonic group is selected from a polyvinyl sulfonic acid, a polystyrene sulfonic acid, a polyallyl sulfonic acid, a polyacrylic ethyl sulfonic acid, a polyacrylic butyl sulfonic acid, a poly(2-acrylamide-2-methylpropane sulfonic acid) and a polyisoprene sulfonic acid, the monomer for obtaining a conjugated conductive polymer is thiophene which may have a substituent group, the dispersion medium of the polymerization step is water or a mixed solvent of water and a water soluble solvent, and the polymerization is performed by using at least one oxidation agent selected from a peroxodisulfuric acid and a salt thereof.