A developer container of the present invention includes a container main body and a supporting member. The container main body is used to contain a developer. The supporting member supports the container main body in such a manner that the container main body is freely rotatable. Further, the container main body includes an inwardly depressed recess portion on its outer peripheral surface. In that recess portion, a discharging opening is provided to discharge the developer into that recess portion opposite the direction in which the container main body rotates around the axis of rotation. Further, a regulating member having a tube-like shape is provided which surrounds the discharging opening to regulate the discharged amount of the developer.