The method for producing a conductive polymer particle dispersion and method of manufacturing an electrolytic capacitor using the conductive polymer microparticle dispersion

And monomers of thiophenes, polyanions as a dopant, is dispersed in water to prepare a dispersion of the monomers. This and dispersion of the monomers, by mixing the oxidizing agent containing a first oxidizing agent to produce iron ions to oxidative polymerization of monomers. End of polymerisation, the concentration of the trivalent iron ions in the polyanion polythiophene dispersion of doped conductive, relative polythiophene 100 parts by weight, 3 parts by weight or more, 30 parts by weight or less.