Electrophotographic photosensitive member, process cartridge, and image forming apparatus

An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer of a single layer, wherein

• the photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material,
• the binder resin includes a polyester resin,
• the polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below, and
• a content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass,
• where in the general formula (1), X represents a phenylene group optionally substituted by a first substituent, the first substituent being a phenyl group, an alkyl group having a carbon number of at least 1 and no greater than 8, or an alkoxy group having a carbon number of at least 1 and no greater than 8, and
• in the general formula (2), Y represents a divalent aliphatic hydrocarbon group having a carbon number of at least 1 and no greater than 8 and optionally substituted by a second substituent, the second substituent being a phenyl group or an alkoxy group having a carbon number of at least 1 and no greater than 8.