An image forming apparatus includes an image bearing member, a charging member to charge a surface of the image bearing member, an exposure unit, a developing member to form a toner image, a transfer member, an irradiation unit, and a blocking member. The irradiation unit includes a light source provided at one end of the irradiation unit in a rotation axial direction of the image bearing member and a guide that guides a light source emitted light in the rotation axial direction. The irradiation unit irradiates the surface of the image bearing member with the light after the transfer member transfers the toner image to a transfer-receiving member. The blocking member blocks the light irradiated from the irradiation unit in the rotation axial direction. The blocking member is configured so that a quantity of blocking the light irradiated from the irradiation unit is different in the rotation axial direction.