A positive charging electrophotographic photoreceptor, comprising:
- a conductive support;
- a photosensitive layer;
- and a protective layer in this order, the photosensitive layer containing a charge generation substance, a positive hole transport substance, and an electron transport substance in the same layer,
- wherein the positive hole transport substance includes at least one of the compounds represented by any one of the following formulas (1) to (5), and
- a binder resin of the protective layer is a thermoplastic resin selected from the group consisting of a polyamide resin which is soluble in alcohol or a polyvinyl acetal resin which is soluble in alcohol,
- in the formula (1), Ar1 to Ar6 each independently represent an aryl group which may have a substituent;
- n1 represents an integer of 2 or greater;
- Z represents a monovalent organic residue;
- and m1 represents an integer of 0 to 4, here, at least one of Ar1 and Ar2 represents an aryl group having a substituent,
- in the formula (2), R1 to R7 each independently represent a hydrogen atom, an alkyl group, an aryl group;
- and an alkoxy group;
- n2 represents an integer of 1 to 5;
- k2, l2, q2, and r2 each independently represent an integer of 1 to 5;
- and m2, o2 and p2 each independently represent an integer of 1 to 4,
- in the formula (3), Ar7 to Ar11 each independently represent an aryl group which may have a substituent;
- and Ar12 to Ar15 each independently represent an arylene group which may have a substituent;
- m3 and n3 each independently represent an integer of 1 to 3,
- in the formula (4), R8 to R12 each independently represent a hydrogen atom, an alkyl group, an aryl group, and an alkoxy group;
- k4, n4, and o4 each independently represent an integer of 1 to 5;
- and 14 and m4 each independently represent an integer of 1 to 4,
- in the formula (5), R13 to R18 each independently represent an alkyl group and an alkoxy group;
- m5, n5, p5 and q5 each independently represent an integer of 0 to 5;
- and o5 and r5 each independently represent an integer of 0 to 4;
- in a case where m5, n5, o5, p5, q5 and r5 are integers of 2 or greater respectively, each of a plurality of R13 to R18 is bonded to the adjacent one of the plurality of R13 to R18 to form a ring structure,
- wherein with respect to a ratio of a total content of the compounds represented by any one of the above formulas (1) to (5) to a content of the electron transport substances, the total content is 0.5 part by weight or more and 40 parts by weight or less relative to 1 part by weight of the electron transport substance, and
- wherein the protective layer consists essentially of the binder resin and particles of metal oxide.