Electrophotographic photosensitive member comprising an azo pigment as a charge generating material

An electrophotographic photosensitive member comprising a conductive support and a photosensitive layer provided on said conductive support, wherein said photosensitive layer contains an azo pigment as a charge-generating material represented by the following Formula (1), ##STR9## wherein Ar represents an aromatic hydrocarbon group which may be bonded through a bonding group and may have a substituent, or a heterocyclic group which may be bonded through a bonding group and may have a substituent;

• X represents a residual group necessary to complete upon condensation with the benzene ring an aromatic hydrocarbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent;
• Cp represents the following Formula (2), (3) or (4), ##STR10## wherein Y represents an oxygen atom, a sulfur atom or a dicyanomethylene group;
• and Z represents an imino group, a sulfinyl group or a sulfonyl group, ##STR11## wherein R represents an alkyl group or an aryl group, ##STR12## and m is an integer of 0 or 1, and n is an integer of 1, 2 or 3.