An electrophotographic photoreceptor for use in an image forming apparatus having a proximity charge-type charging unit includes a conductive support and at least photosensitive layer and surface layer laminated in order on the conductive support, wherein the surface layer includes (A) a charge transport material, (B) a cured product of a composition containing a polymerizable compound and inorganic fine particles, and (C) organic fine particles, and the inorganic fine particles contain a metal oxide, has a surface treated with a surface treatment agent having a reactive organic group, and has a volume resistivity of 1.21011 .Math.cm or more.

An electrophotographic photosensitive member includes a support, a photosensitive layer, and a surface layer. The surface layer includes a cured product of a composition containing an organic salt having a polymerizable functional group, and at least one of a charge-transportable compound or electroconductive particles. The organic salt is formed of an organic cation and at least one of BF.sub.4.sup., PF.sub.6.sup., (CF.sub.3SO.sub.2).sub.2N.sup., CF.sub.3SO.sub.3.sup., (FSO.sub.2)N.sup., C.sub.2H.sub.5OSO.sub.3.sup., (CN).sub.2N.sup., SCN.sup., CH.sub.3COO.sup., NO.sub.3.sup., Cl.sup., Br.sup. or I.sup..

A contact charging type image forming apparatus, to which only a direct current voltage is applied, includes an electrophotographic photoreceptor that includes a conductive base material A and a photosensitive layer provided on the conductive base material A, and a charging member that includes a conductive base material B and an elastic layer provided on the conductive base material B, in which in a case where a dielectric film thickness of the electrophotographic photoreceptor is defined as L, and a resistance component of an impedance of the charging member in a range of 1 Hz or greater and 500 Hz or less, which is measured by an alternating current impedance method, is defined as R, Expression (1) is satisfied.
L<0.75log.sub.e(R)+15.79Expression(1)

This electrophotographic photoreceptor includes at least a laminated photoreceptive layer, in which a charge generating layer and a charge transporting layer are laminated in this order on a conductive base. The charge transporting layer contains at least a charge transporting substance, a binder resin, and silica particles, and contains 0.1 ppm or more and 20 ppm or less of Na element and/or 0.01 ppm or more and 10 ppm or less of K element.

An electrophotographic photoreceptor includes a charge transport layer, the charge transport layer contains a polyester resin (1) having a dicarboxylic acid unit (A) represented by Formula (A) and a diol unit (B) represented by Formula (B), and a charge transport material, and in a case where a value A is a weight-average molecular weight Mw of the polyester resin (1) contained in the charge transport layer divided by 10,000 (A=Mw/10,000), a value of a ratio M1/M2 of a mass M1 of the charge transport material contained in the charge transport layer to a mass M2 of the charge transport layer is defined as Cs, and an average thickness of the charge transport layer is defined as Ds (m), expressions of 5A40, 0.28Cs0.55, 27Ds50, and 2.5(ADs)/(Cs100)70.0 are satisfied. ##STR00001##