A developer apparatus, includes: a container which houses toner; a toner carrier roller which is provided, on a surface thereof, with a plurality of convex sections which are regularly arranged and a concave section which surrounds the convex sections, is shaped approximately like a cylinder, and rotates while carrying a toner layer of charged toner supplied from the container on the surface thereof; and a restriction member which abuts on the toner layer on the surface of the toner carrier roller to restrict a thickness of the toner layer, and restricts the toner layer carried by the convex sections within the surface of the toner carrier roller to one layer or less.