An electrophotographic photoreceptor, comprising an electroconductive substrate, an undercoat layer comprising a binder resin and metal oxide particles having a refractive index of at least 2.0 formed on the electroconductive substrate, and a photosensitive layer formed on the undercoat layer, wherein a ratio of a specular reflection of the undercoat layer calculated as a thickness of 2 μm to a light having a wavelength of 480 nm, to the specular reflection of the electroconductive substrate to a light having a wavelength of 480 nm, is at least 50%.