A photoreceptor comprising: an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate; and optionally a protective layer located overlying the photosensitive layer, wherein an outermost layer of the photoreceptor comprises a filler and an organic compound having an acid value of from 10 to 700 mg KOH/g, characterised in that the outermost layer of the photoreceptor comprises at least one compound selected from the groups consisting of: (a) compounds having the following formula: wherein R 1 and R 2 independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and are optionally bonded together to form a heterocyclic group including a nitrogen atom; Ar 1 and Ar 2 independently represent a substituted or an unsubstituted aromatic ring group; k and m independently represent 0 or an integer of from 1 to 3, wherein k and m are not 0 at the same time; and n represents an integer of from 1 to 3; and (b) compounds having the following formula: wherein R 3 and R 4 independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and are optionally bonded together to form a heterocyclic group including a nitrogen atom; Ar 3 and Ar 4 independently represent a substituted or an unsubstituted aromatic ring group; K and M independently represent 0 or an integer of from 1 to 3, wherein K and M are not 0 at the same time; and n' represents an integer of from 1 to 3. an electroconductive substrate; a photosensitive layer located overlying the electroconductive substrate; and optionally a protective layer located overlying the photosensitive layer, wherein an outermost layer of the photoreceptor comprises a filler and an organic compound having an acid value of from 10 to 700 mg KOH/g, characterised in that the outermost layer of the photoreceptor comprises at least one compound selected from the groups consisting of: (a) compounds having the following formula: wherein R 1 and R 2 independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and are optionally bonded together to form a heterocyclic group including a nitrogen atom; Ar 1 and Ar 2 independently represent a substituted or an unsubstituted aromatic ring group; k and m independently represent 0 or an integer of from 1 to 3, wherein k and m are not 0 at the same time; and n represents an integer of from 1 to 3; and (b) compounds having the following formula: wherein R 3 and R 4 independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and are optionally bonded together to form a heterocyclic group including a nitrogen atom; Ar 3 and Ar 4 independently represent a substituted or an unsubstituted aromatic ring group; K and M independently represent 0 or an integer of from 1 to 3, wherein K and M are not 0 at the same time; and n' represents an integer of from 1 to 3. (a) compounds having the following formula: wherein R 1 and R 2 independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and are optionally bonded together to form a heterocyclic group including a nitrogen atom; Ar 1 and Ar 2 independently represent a substituted or an unsubstituted aromatic ring group; k and m independently represent 0 or an integer of from 1 to 3, wherein k and m are not 0 at the same time; and n represents an integer of from 1 to 3; and (b) compounds having the following formula: wherein R 3 and R 4 independently represent a substituted or an unsubstituted aromatic hydrocarbon group, or a substituted or an unsubstituted alkyl group, and are optionally bonded together to form a heterocyclic group including a nitrogen atom; Ar 3 and Ar 4 independently represent a substituted or an unsubstituted aromatic ring group; K and M independently represent 0 or an integer of from 1 to 3, wherein K and M are not 0 at the same time; and n' represents an integer of from 1 to 3.