The invention relates to an image forming apparatus and a charging member. The image forming apparatus includes a photoreceptor and a charging member. The photoreceptor includes a long-shaped raw pipe and a photoconductive layer that covers a center portion of the raw pipe in a longitudinal direction and forms exposed parts at ends of the raw pipe in the longitudinal direction. The charging member is arranged in parallel to the photoreceptor through a gap. The charging member includes a long-shaped conductive support body and a resistance adjustment layer that covers a center portion of the conductive support body in the longitudinal direction, and charges the photoconductive layer. Besides, the charging member includes a gap keeping member and a discharge preventing part. The gap keeping member is provided at a position outwardly spaced from a photoconductive layer opposite area by a specified distance in the longitudinal direction of the conductive support body, contacts the exposed part, and keeps a gap between the resistance adjustment layer and the photoconductive layer. The discharge preventing part covers a separation area between the resistance adjustment layer and the gap keeping member in the longitudinal direction of the conductive support body, and prevents discharge from the exposed part to the separation area.