Electrophotographic photoreceptor, method for manufacturing same, and electrophotographic apparatus using same

An electrophotographic photoreceptor that is a negatively-chargeable laminate-type electrophotographic photoreceptor, comprising:

• a conductive substrate;
• a charge generation layer that is provided on the conductive substrate and that includes a charge generating material;
• and
• a charge transport layer that is provided on the charge generation layer and that comprises:
• as a binder resin, a copolymerized polycarbonate resin having a repeating unit represented by General Formula (1) below:
• where R1 and R2 are the same or different and each represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a fluoroalkyl group having 1 to 10 carbon atoms;
• n and m satisfy 0.4≤n/(m+n)≤0.6;
• and a chain terminal group is a monovalent aromatic group or a monovalent fluorine-containing aliphatic group;
• as a hole transporting substance, a compound having a structure represented by General Formula (2) below:
• where R3 to R24 are the same or different and each represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, an aryl group, or an aryl group-substituted alkenyl group;
• as an electron transporting substance, a compound having a structure represented by General Formula (3) below:
• where R25 to R28 are the same or different and each represents a hydrogen atom, a lower alkyl group, a halogen atom, a cyano group, a nitro group, an aryl group optionally having a substituent, or a heterocyclic group optionally having a substituent;
• and
• as an antioxidant, a compound represented by Structural Formula (4) below:
• and
• wherein a mass ratio H/(B+H) represents a ratio of mass (H) of the hole transporting substance with respect to a sum of mass (B) of the binder resin and the mass (H) of the hole transporting substance in the charge transport layer, and satisfies Formula (5) below:
• 20% by mass≤H/(B+H)≤35% by mass (5).