A developer cartridge to be used with an electrophotographic image forming device comprising: a frame having one side in a first direction; a carrying member that carries a toner and is rotatably supported by the frame, the carrying member extending in the first direction; and an electrode that is supported by the one side of the frame, the electrode including an electrode plate that comprises: a base portion that 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; and a first extending portion that extends from one end thereof to another end thereof in the first direction, the one end of the first extending portion being connected to the another end of the base portion, wherein the frame has one end part and another end part in the second direction, the carrying member being supported at one end part of the frame, characterized in that the electrode plate further comprises: a second extending portion that 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 being connected to the another end of the first extending portion; and an input portion that is connected to the another end of the second extending portion and inputs electrical power from an external device, wherein the electrode plate is deformable so that the second extending portion and the input portion can be bent against the biasing force of the electrode plate such that a distance between the base portion and the second extending portion becomes smaller, the frame including a protruding portion that is located at the another end part of the frame and outwardly protrudes in the first direction from the outer surface, wherein when the electrode is deformed, the input portion is configured to move in the first direction between the outer surface and an outward end of the protruding portion in the first direction. a frame having one side in a first direction; a carrying member that carries a toner and is rotatably supported by the frame, the carrying member extending in the first direction; and an electrode that is supported by the one side of the frame, the electrode including an electrode plate that comprises: a base portion that 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; and a first extending portion that extends from one end thereof to another end thereof in the first direction, the one end of the first extending portion being connected to the another end of the base portion, a base portion that 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; and a first extending portion that extends from one end thereof to another end thereof in the first direction, the one end of the first extending portion being connected to the another end of the base portion, wherein the frame has one end part and another end part in the second direction, the carrying member being supported at one end part of the frame, characterized in that the electrode plate further comprises: a second extending portion that 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 being connected to the another end of the first extending portion; and an input portion that is connected to the another end of the second extending portion and inputs electrical power from an external device, wherein the electrode plate is deformable so that the second extending portion and the input portion can be bent against the biasing force of the electrode plate such that a distance between the base portion and the second extending portion becomes smaller, the frame including a protruding portion that is located at the another end part of the frame and outwardly protrudes in the first direction from the outer surface, wherein when the electrode is deformed, the input portion is configured to move in the first direction between the outer surface and an outward end of the protruding portion in the first direction. a second extending portion that 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 being connected to the another end of the first extending portion; and an input portion that is connected to the another end of the second extending portion and inputs electrical power from an external device, wherein the electrode plate is deformable so that the second extending portion and the input portion can be bent against the biasing force of the electrode plate such that a distance between the base portion and the second extending portion becomes smaller, the frame including a protruding portion that is located at the another end part of the frame and outwardly protrudes in the first direction from the outer surface, wherein when the electrode is deformed, the input portion is configured to move in the first direction between the outer surface and an outward end of the protruding portion in the first direction.