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 (i) a first container portion, (ii) a second container portion, and (iii) a third container portion. The third container portion includes a first and a second recess portion on its outer peripheral surface. The first recess portion is inwardly depressed in a radial direction of the third container portion. The second recess portion is so provided that the second recess portion is located oppositely to the first recess portion with respect to an axis line of the third container portion. In the first recess portion, a discharging opening is provided in the first recess portion so as to discharge the developer in a rotation direction in which the container main body rotates around the axis line. Further, a regulating member having a tube-like shape is provided so that the regulating member surrounds the discharging opening. The regulating member regulates a discharging amount of the developer. This allows the developer to be always evenly supplied.