Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor comprising:

• a conductive substrate;
• and
• a single layer type photosensitive layer disposed on the conductive substrate,
• wherein the single layer type photosensitive layer contains a polyester resin having a structure represented by Formula (1) at a terminal, a charge generation material, and a charge transport material,
• a proportion of the structure represented by Formula (1) at the terminal of the polyester resin is 60% by mole or greater with respect to a total number of the terminal of the polyester resin, and
• in a case where a weight-average molecular weight Mw of the polyester resin is defined as A (×10,000), a value of a ratio M3/M4 of a mass M3 of the charge transport material to a total mass M4 of the single layer type photosensitive layer is defined as Ct, and an average thickness of the single layer type photosensitive layer is defined as Dt (μm),
• expressions of 7≤A≤40,
• 0.40≤Ct≤0.60,
• 27≤Dt≤50, and
• 3.2≤(A×Dt)/(Ct×100)≤48 are satisfied,
• in Formula (1), nd represents an integer of 0 or greater and 4 or less, each Rd independently represents a hydrocarbon group having 1 or more and 4 or less carbon atoms, L represents an ether bond or a —O—C(═O)— group, and * represent a bonding portion.