The developing apparatus includes a developing container in which a developer containing a toner and a carrier is stored, a developing roller which carries the developer, and agitating transporting members which circulate and transport the developer along a rotary axis line of a developing roller while mixing and agitating the developer. The developer container includes a developing zone portion corresponding to the developing roller and an extended zone portion which is provided adjacent to the developing zone portion in an axial direction of the developing roller. The developer container is provided with a developer blocking member which separates the developing zone portion and the extended zone portion. The developer container is provided with valves which open in a developer transporting direction in a communicating portion of the developer blocking member between the developing zone portion and the extended zone portion.