Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor comprising:

• a conductive substrate;
• an undercoat layer formed on the conductive substrate and containing a polyurethane resin, metal oxide particles, a silane coupling agent, and a compound represented by General Formula (ID);
• and
• a photosensitive layer formed on the undercoat layer
• (where R1 to R8 each independently represent a hydrogen atom, a nitro group, a cyano group, a halogen atom, a hydroxyl group, a saturated or unsaturated aliphatic hydrocarbon group optionally having a substituent, an aromatic hydrocarbon group optionally having a substituent, an alkoxy group optionally having a substituent, an aryloxy group optionally having a substituent, a sulfo group optionally having a substituent, an amino group, an alkylamino group optionally having a substituent, or an arylamino group optionally having a substituent;
• and R1 and R2, R2 and R3, R3 and R4, R5 and R6, R6 and R7, and R7 and R8 are optionally individually bonded to each other to form aromatic rings), wherein
• an amount of the silane coupling agent is approximately from 5 parts by mass to 15 parts by mass relative to 1 part by mass of the compound represented by General Formula (ID).