Positively chargeable electrophotographic photosensitive member and image forming apparatus

A positively chargeable electrophotographic photosensitive member comprising a photosensitive layer, wherein

• the photosensitive layer includes, layered in the stated order,
• a charge transport layer at least containing a hole transport material and a binder resin, and
• a charge generating-and-transporting layer at least containing a charge generating material, an electron transport material, a hole transport material, and a binder resin all in the charge generating-and-transporting layer,
• the charge generating-and-transporting layer contains as the electron transport material one or more compounds represented by chemical formulas ET1, ET2, ET3, ET4, ET5, ET7, ET8, and ET9 below,
• the binder resin contained in the charge transport layer is different from the binder resin contained in the charge generating-and-transporting layer, and
• from among the binder resins contained in the charge transport layer and the charge generating-and-transporting layer, one of the binder resins contains a polyvinyl acetal resin and the other of the binder resins contains no polyvinyl acetal resin.