| 摘要 |
A development device includes: a development unit which includes a developer housing room in which developer composed of toner and carrier is housed, sets a developer agitating and transporting member in the developer housing room, and sets a developer bearing member which can bear and transport the developer agitated and transported by the developer agitating and transporting member; and a toner supply unit which includes a toner supply room in which at least supply toner is housed, sets a toner transporting member in the toner supply room, and communicates the toner supply room with the developer housing room of the development unit through a toner supply port, wherein the toner supply port of the toner supply unit opens so that its lower end is located in the lower position than the surface position of the developer housed in the developer housing room.
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