NOVELTY - Thiol group-containing charge transporting material (I), is claimed.    USE - (I) is useful for forming a film in photoelectric conversion device, and useful in electrophotographic photoreceptor, which is useful in image forming apparatus and process cartridge (all claimed). (I) is useful for forming a solar cell, and an organic transistor.    ADVANTAGE - (I) provides a film with increased strength, high thickness and excellent electrical characteristics, heat resistance and solvent resistance.    DETAILED DESCRIPTION - Thiol group-containing charge transporting material having a structure of formula (F-((G)a1-(X)a2-Y1-SH)b) (I), is claimed.    F = organic group derived from a charge transporting compound;    G = 1-5C divalent organic group;    X = -CO-O-, -O-CO-, or -O-;    Y1 = 1-5C divalent organic group;    a1, a2 = 0 or 1; and    b = 1 or more or 6 or less.    INDEPENDENT CLAIMS are included for:    (1) a photoelectric conversion device comprising a film formed by using a dissolving solution in which a thiol group-containing charge transporting material of formula (F-((G)a-(X)-Y1-SH)b) (Ia) is dissolved;    (2) an electrophotographic photoreceptor comprising a layer formed on a conductive substrate (4), using a dissolving solution in which (I) is dissolved, or having a conductive substrate, and a photosensitive layer containing a polymer formed by polymerization of at least one kind of (I) and at least one kind of the compound having an unsaturated bond, on the conductive substrate;    (3) an image forming apparatus comprising the electrophotographic photoreceptor having the photosensitive layer, a charging device that charges the surface of the electrophotographic photoreceptor, an exposure device that exposes the surface of the charged electrophotographic photoreceptor to form an electrostatic latent image on the surface, a developing device that develops the electrostatic latent image to form a toner image, and a transfer device that transfers the toner image to a transfer medium; and    (4) a process cartridge comprising the electrophotographic photoreceptor comprising the photosensitive layer, where the process cartridge is detachable from an image forming apparatus.    a = 0 or 1.    DESCRIPTION OF DRAWING(S) - The figure shows a partial cross-sectional view of layer configuration of the electrophotographic photoreceptor.    Undercoat layer (1)    Charge generating layer (2)    Charge transporting layer (3)    Conductive substrate (4)    Protective layer. (5)