NOVELTY - An organic photoelectric conversion element (10) comprises: a first electrode (12); a second electrode (13); and organic photoelectric conversion layer sandwiched between the first electrode and second electrode. The first electrode comprises: a conductive fiber layer; and a transparent conductive layer containing a conductive polymer (P1) comprising a pi-conjugated conductive polymer and a polyanion, and an aqueous binder, and at least a part of the transparent conductive layer contains the conductive polymer and cross-linked aqueous binder.    USE - As an organic photoelectric conversion element (claimed) useful for organic thin film solar cells.    ADVANTAGE - The organic photoelectric conversion element contains a flexible transparent electrode substrate which can achieve a large sized format and high durability. The organic photoelectric conversion element is excellent in photoelectric conversion efficiency.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for forming an organic photoelectric conversion element involving: coating a conductive fiber containing liquid on a substrate (11); drying the coated conductive fiber containing liquid; coating a liquid containing a conductive polymer (P1) comprising a pi-conjugated conductive polymer and a polyanion, and an aqueous binder comprising a polymer (A1) having the recurring units of formula -(CH2-C(X1)(OR1-OH))l-, -(CH2-C(X2)(COOR2-OH))m-, and -(CH2-C(X3)(CONH-R3-OH))n-, to form the first electrode; forming the organic photoelectric conversion layer; and forming the second electrode.    X1-X3=H or methyl;    R1-R3=2-5C alkylene;    l-n=ratio of each recurring unit when the total molar number of monomers composing polymer (A1) is set to be 100.    Provided that the sum l+m+n is 50-100.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a solar cell having the organic photoelectric conversion element (10).    Substrate (11)    First electrode (12)    Second electrode (13)    Positive hole transport layer (17)    Electron transport layer (18)