An electrophotographic photoreceptor is provided with a photosensitive layer, which contains an azo compound having in the molecule thereof at least one azo group coupled with a coupler residuum represented by the following general formula (I):
wherein X means a residuum capable of condensing with a benzene ring to form a substituted or unsubstituted aromatic hydrocarbon ring or a substituted or unsubsti­tuted aromatic heterocyclic ring, Y denotes a hydrogen or halogen atom or an alkyl or alkoxy group, and n stands for an integer of 0 - 3.