NOVELTY - An electrode component consists of a substrate having an electroconductive portion on the surface, and a conductive polymer layer laminated on the electroconductive portion. The conductive polymer layer consists of a polymer comprising monomer(s) chosen from thiophene having substituent in 3-position and 4-position, and an anion having a molecular weight of 200 or more generated from compound(s), which is a non-sulfonic-acid type organic compound as dopant with respect to the polymer. The conductive polymer layer has a density of 1.15-1.8 g/cm3.    USE - Electrode component is used for organic thin-film solar cells and dye-sensitized solar cells (all claimed).    ADVANTAGE - The electrode component has excellent heat resistance, environmental stability, transparency, hole transport property, catalytic property, and light resistance.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) manufacture of electrode component, which involves preparing a polymerization liquid containing the monomer and a solvent consisting of water (100-80 %mass) and organic solvent (0-20 %mass), immersing a substrate into the polymerization liquid, and forming a conductive polymer layer by electrolytically polymerizing the monomer on the electroconductive portion of substrate;    (2) organic thin-film solar cell consisting of an anode having an electroconductive portion on the surface, a hole transport layer laminated on the electroconductive portion, a photoelectric-conversion layer laminated on the hole taking-out layer, and containing a hole-transport material and an electron transporter, and a cathode laminated on the photoelectric-conversion layer. The anode and hole transport layer consist of the electrode component; and    (3) dye-sensitized solar cell consisting of a cathode having a semiconductor layer containing a pigment as a photosensitizer, an electrolyte layer including redox pair species and laminated on the semiconductor layer, and an anode having conductor polymer layer laminated on the electrolyte layer, and acting as catalyst which converts oxide species into reduction species. The anode consists of the electrode component.