NOVELTY - Photoelectric conversion element (10) comprises: a substrate (1); a first electrode (2); a photoelectric conversion layer (6) including semiconductors and sensitizing dyes; a positive hole transport layer including a solid positive hole transport substance; and a second electrode (8), where the solid positive hole transport substance contains a conductive polymer which contains substituted thiofuran compound (I), and the sensitizing dyes include a substituted amine compound (II) and e.g. substituted 3-imino-3H-isoindol-1-yl-metal complex (III) or substituted porphyrinyl-metal complex (IV).    USE - The photoelectric conversion element is useful for a solar cell.    ADVANTAGE - The photoelectric conversion element: exhibits high photoelectric conversion efficiency; utilizes a substrate that exhibits excellent heat resistance; and can be manufactured in an economical manner.    DETAILED DESCRIPTION - Photoelectric conversion element (10) comprises: a substrate (1); a first electrode (2); a photoelectric conversion layer (6) including semiconductors and sensitizing dyes; a positive hole transport layer including a solid positive hole transport substance; and a second electrode (8), where the solid positive hole transport substance contains a conductive polymer which contains substituted thiofuran compound of formula (I), and the sensitizing dyes include a substituted amine compound of formula (((R3)3-n)-N-(Ar1-(A1p)-(A2q)-Z1n)) (II) and at least one of substituted 3-imino-3H-isoindol-1-yl-metal complex of formula (III), substituted porphyrinyl-metal complex of formula (IV), substituted 2-(2-hydroxy-3-indan-2-ylidenemethyl-4-oxo-cyclobut-(E)-ylidenemethyl)-2,3-dihydro-1H-indolium compounds of formula (V), substituted 2-hydroxy-3-indan-2-ylidenemethyl-4-oxo-cyclobutoxy compound of formula (VI), substituted 4-((E)-2-(3-(1-(2,3-dihydro-1H-indol-2-yl)-meth-(E)-ylidene)-2-hydroxy-4-oxo-cyclobutyl)-vinyl)-phenylamino compound of formula (VII) or substituted 4-((E)-2-(2-hydroxy-3,4-dioxo-cyclobutyl)-vinyl)-phenylamino compound of formula (VIII).    Either R1, R2 = alkyl, alkoxy, alkenyl or aryl (all optionally substituted) or H; or    R1R2 = ring;    n = 1-3;    Ar1 = aromatic group;    R3 = alkyl (optionally substituted), H, halo, alkoxy, alkenyl, alkynyl, aryl, amino, CN or heterocyclyl, where n is 1, two R3 may be different from each other, and R3 may link to other substituent group so as to form a ring;    A1, A2 = alkylene, allylene or heterocyclyl (all optionally substituted), single bond or divalent optionally saturated hydrocarbyl;    p, q = 0-6;    Z1 = organic group attaining at least one OH or acidic group, when n is greater than or equal to 2, many A1, A2, and Z may be different from each other;    R11-R26 = alkyl, alkoxy, aryl or phenoxy (all optionally substituted), H or halo, where an acidic group is included in at least one position on R11-R26;    M = 2H or a divalent, trivalent or tetravalent metal atom that may include a substituent group;    R31-R42 = alkyl, alkenyl, alkynyl, aryl, amino, heterocyclyl (all optionally substituted), H, halo or a group forming a ring-shaped structure or ring-fused structure directly or via other bonded atom, where an acidic group is included in at least one position on R31-R42;    R53, R54, R57, R58 = alkyl, alkenyl, alkynyl, aryl, heterocyclyl (all optionally substituted), H or halo, where an acidic group is included in at least one position on the above section;    R51, R52, R55, R56 = alkyl with the same number of carbons or the different number of carbons, aryl or alkyl-substituted aryl;    R59-R62 = alkyl, alkenyl, alkynyl, aryl, heterocyclyl (all optionally substituted), H or halo, where an acidic group is included on R61; either    R63, R64 = alkyl, alkenyl, alkynyl, aryl or heterocyclyl (all optionally substituted); or    R63R64 = ring; and    k = natural number.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of the photoelectric conversion element.    Substrate (1)    First electrode (2)    Photoelectric conversion layer (6)    Second electrode (8)    Photoelectric conversion element (10)