The present invention provides a development roller disposed in proximity of a photosensitive body which is charged by a charging member and on which an electrostatic latent image is formed, the development roller performing development by transferring toner to the photosensitive body. The development roller includes a toner layer formation area where a toner layer is formed on a surface of a development roller main body portion and a small diameter portion which has a diameter smaller than that of the toner layer formation area and which is located in at least a part of an area where the toner layer is not formed on the surface of the development roller main body portion.