A charging roller is provided. The charging roller is configured to face an image carrier at a predetermined charging gap and charge the image carrier in a non-contact state. A conductive shaft is provided with a pair of annular concave portions formed on an outer circumferential surface at both ends thereof. A conductive layer is formed on the outer circumference surface at a center portion of the conductive shaft defined between the pair of concave portions. An insulating layer is formed on the outer circumferential surface at outer portions of the conductive shaft from the pair of annular concave portions. A depth of the concave portions is larger than a thickness of the conductive layer.