An image forming apparatus includes: a photosensitive drum; a light guide plate that irradiates, onto the photosensitive drum, light incoming through an end thereof by emitting the light from an irradiation end surface thereof; a static elimination light source that is disposed near the end of the light guide plate and emits the light into the light guide plate; and a blocking wall that is disposed between the light guide plate and the photosensitive drum to cover the irradiation end surface, and restricts the light emitted from the irradiation end surface non-uniformly in a longitudinal direction of the light guide plate. Of the light emitted from the irradiation end surface, portions emitted from end regions located around ends of the light guide plate are less restricted by the blocking wall than a portion emitted from a region other than the end regions of the light guide plate.