A developer container includes a developer containing part that has an cylindrical hollow shape inside and contains developer therein; and an agitation member that is elastic and rotatably provided inside the developer containing part, rotating around a rotation axis that is a center of the cylindrical hollow shape, having at least a side edge extending in the rotation axis. The developer containing part has a side wall part on one end thereof in a direction of the rotation axis of the agitation member, the side wall extending to correspond to the side edge of the agitation member and scraping a surface of the side wall while the agitation member rotates, the side wall part has a projection part that projects toward inside of the developer containing part so that the side edge of the agitation member is elastically deformed by the projection part when passing over the projection part.