in a developer cartridge , the base portion is fixed to an outer surface of the one side of the frame , and extends from one end thereof to another end thereof in a second direction orthogonal to the first direction . the first extending portion extends from one end thereof to another end thereof in the first direction . the one end of the first extending portion is connected to the another end of the base portion . the second extending portion extends from one end thereof to another end thereof in a direction opposite to the second direction . the one end of the second extending portion is connected to the another end of the first extending portion . the input portion is connected to the another end of the second extending portion and inputs electrical power from an external device . the electrode is deformable such that a distance between the base portion and the second extending portion becomes smaller .