A developing cartridge for an image forming device that employs an electrophotographic system, the developing cartridge comprising: a casing configured to accommodate therein developer; a rotating member (33, 34) having a rotational shaft (A1, A2) extending in an axial direction, the rotating member (33, 34) being configured to rotate about the rotational shaft (A1, A2) and carry the developer thereon; and an electrode member configured to be electrically connected to the rotating member (33, 34), the electrode member covering at least part of the rotational shaft (A1, A2) from an orthogonal direction orthogonal to the axial direction and being arranged to confront the casing in the axial direction, the electrode member being configured to move in the orthogonal direction in accordance with a movement in the axial direction, wherein the electrode member comprises: an insertion part into which the rotational shaft (A1, A2) is rotatably inserted; a contact part arranged to confront but be separated from the insertion part in the orthogonal direction and configured to contact an external electrode; and a coupling part coupling the insertion part and the contact part, characterized in that the contact part of the electrode member is arranged to move away from the rotational shaft (A1, A2) in accordance with a movement of the electrode member in a first direction along the axial direction from the electrode member toward the casing. a casing configured to accommodate therein developer; a rotating member (33, 34) having a rotational shaft (A1, A2) extending in an axial direction, the rotating member (33, 34) being configured to rotate about the rotational shaft (A1, A2) and carry the developer thereon; and an electrode member configured to be electrically connected to the rotating member (33, 34), the electrode member covering at least part of the rotational shaft (A1, A2) from an orthogonal direction orthogonal to the axial direction and being arranged to confront the casing in the axial direction, the electrode member being configured to move in the orthogonal direction in accordance with a movement in the axial direction, wherein the electrode member comprises: an insertion part into which the rotational shaft (A1, A2) is rotatably inserted; a contact part arranged to confront but be separated from the insertion part in the orthogonal direction and configured to contact an external electrode; and a coupling part coupling the insertion part and the contact part, characterized in that the contact part of the electrode member is arranged to move away from the rotational shaft (A1, A2) in accordance with a movement of the electrode member in a first direction along the axial direction from the electrode member toward the casing. an insertion part into which the rotational shaft (A1, A2) is rotatably inserted; a contact part arranged to confront but be separated from the insertion part in the orthogonal direction and configured to contact an external electrode; and a coupling part coupling the insertion part and the contact part, characterized in that the contact part of the electrode member is arranged to move away from the rotational shaft (A1, A2) in accordance with a movement of the electrode member in a first direction along the axial direction from the electrode member toward the casing.