To provide a new naphthalimide derivative capable of providing a highly sensitive electrophotographic photoreceptor, and an electrophotographic photoreceptor which is excellent in sensitivity properties and has a photosensitive layer excellent in durability and solvent resistance.

The naphthalimide derivative is represented by general formula (1) (wherein Ra and Rb are each a 1-6C alkyl group, 1-6C alkoxy group, 3-8C cycloalkyl group, 6-20C aryl group or 7-18C aralkyl group; m is an integer of 0-5; and A is an imide such as a phthalimide compound). The electrophotographic photoreceptor comprises a conductive substrate and, provided thereon, a photosensitive layer containing a charge-generating agent, the naphthalimide derivative represented by general formula (1) and a binder resin.