An image forming apparatus has an intermediate transfer belt and a plurality of image forming units located along the intermediate transfer belt. Each image forming unit has a photosensitive drum, a charger that charges the photosensitive drum, a developing device that forms a toner image by attaching toner to an electrostatic latent image formed by exposure after charging, a transfer device that transfers the toner image formed on the photosensitive drum to the intermediate transfer belt, a cleaning device that removes toner remaining on the photosensitive drum, and a neutralization device that neutralizes the photosensitive drum using neutralization light. The neutralization device of at least one of the image forming units irradiates the photosensitive drum with neutralization light, irradiates the intermediate transfer belt with neutralization light, and irradiates the photosensitive drum of the adjacent image forming unit with reflected light of neutralization light from the intermediate transfer belt.