Electrophotographic photosensitive member

An electrophotographic photosensitive member comprising a photosensitive layer comprising a combination of a carrier generating phase and a carrier transporting phase provided on an electroconductive support, said carrier generating phase containing a bisazo compound represented by the formula [I] shown below and said carrier transporting phase containing a carrier transporting material selected from the group consisting of at least one of styryl compounds represented by the formula [II] shown below, amine derivatives represented by the formula [III], hydrazone compounds represented by the formula [IV], [V] and [VI] and carbazole derivatives represented by the formula [VII]:

• ##STR21## wherein each of Ar.sub.1, Ar.sub.2 and Ar.sub.3 represents a divalent carbocyclic aromatic residue or a divalent heterocyclic aromatic residue;
• each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represents an electron attracting group or a hydrogen atom, provided that 1 or 2 of R.sub.1 to R.sub.4 are electron attracting groups and the case where R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4 are electron attracting groups at the same time is excluded;
• A is a group represented by the following formula:
• ##STR22## wherein X is a hydroxyl group, ##STR23## where each of R.sub.6 and R.sub.7 is a hydrogen atom, an alkyl group and R.sub.8 is an alkyl group or an aryl group;
• Y is a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a carboxyl group, a sulfo group, a carbamoyl group or a sulfamoyl group;
• Z is a group of atoms necessary for forming a carbocyclic aromatic ring or a heterocyclic aromatic ring;
• R.sub.5 is a hydrogen atom, an amino group, a carbamoyl group, a carboxyl group or its ester group;
• A' is an aryl group;
• n is an integer of 1 to 3;
• and m is an integer of 0 to 4, ##STR24## wherein each of R.sub.9 and R.sub.10 represents an alkyl group or phenyl group;
• R.sub.11 represents a phenyl group, naphthyl group, anthryl group, fluorenyl group or heterocyclic group;
• each of R.sub.12 to R.sub.15 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or an amino group, ##STR25## wherein each of Ar.sub.4 and Ar.sub.5 represents a phenyl group;
• and Ar.sub.6 represents a phenyl group, naphthyl group, anthryl group, fluorenyl group or heterocyclic group, ##STR26## wherein each of R.sub.16 to R.sub.17 represents a hydrogen atom or a halogen atom;
• each of R.sub.18 and R.sub.19 represents an aryl group;
• and Ar.sub.7 represents an arylene group, ##STR27## wherein R.sub.20 represents an aryl group or a heterocyclic group;
• R.sub.21 represents a hydrogen atom, an alkyl group or an aryl group;
• X.sub.1 represents a hydrogen atom, a halogen atom, an alkyl group, an amino group or an alkoxyl group;
• and p represents an integer of 0 or 1, ##STR28## wherein R.sub.22 represents an aryl group or a heterocyclic group;
• R.sub.23 represents a hydrogen atom or an alkyl group;
• X.sub.2 represents a hydrogen atom, a halogen atom, an alkyl group, an amino group, an alkoxy group or a cyano group;
• and q represents an integer of 0 or 1, ##STR29## wherein R.sub.24 represents an aryl group;
• R.sub.25 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amino group or a hydroxyl group;
• and R.sub.26 represents an aryl group or a heterocyclic group.