There is provided a technique in which in a development apparatus to perform replacement of developer, the amount of developer can be stably kept irrespective of a change in a physical property of the developer. There are included a development apparatus that circulates and conveys a developer supplied at a specified timing in a specified conveying chamber and causes the developer to overflow through a discharge port provided in the conveying chamber, a fluidity judgment unit to judge a degree of fluidity of the developer in the conveying chamber, and a speed control unit to control a conveying speed of the developer in a specified range near the discharge port in the conveying chamber to become low relative to an average value of a conveying speed of the developer in a conveying passage except the specified range when the fluidity judged by the fluidity judgment unit is low.