An electrode member is used for supplying power from an image forming apparatus body to a developing roller of a process cartridge when the process cartridge, detachably attachable to the apparatus body, is attached to the apparatus body. The electrode member includes a conductive substrate, and a hole provided in the substrate. The hole includes a groove and an end portion and the width of the end portion of the hole is larger than the width of the groove. The electrode member also includes an elastic portion bent and raised along the hole so that an electrode is able to contact the elastic portion. The electrode member also includes a rib provided opposite and along the end of the hole, an engagement hole for mounting the electrode member to a bearing of the developing roller, and a contact portion making contact with an inner surface of the developing roller, when the electrode member is mounted to the bearing.