Electrophotographic photosensitive member

An electrophotographic photosensitive member comprising:

• a photosensitive layer containing a charge generating material, a hole transport material, a binder resin, and a plasticizer, wherein
• the photosensitive layer is a multi-layer or a single-layer,
• the hole transport material contains a triarylamine derivative represented by General Formula (1),
• the plasticizer contains a compound represented by General Formula (2b),
• in General Formula (1),
• Ar1 represents an aryl group substituted with at least one substituent selected from the group consisting of an alkoxy group having 2 to 4 carbon atoms and an optionally substituted phenoxy group, and
• Ar2 represents an aryl group optionally substituted with an alkyl group having 1 to 4 carbon atoms,
• in General Formula (2b),
• R11 to R18 each independently represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 12 carbon atoms, a hydroxyl group, a cyano group, a nitro group, or an amino group, and
• R represents a single bond, —O— or —CH ═CH—.