A cartridge detachably mountable to a main assembly of an image forming apparatus, includes: a member to be supplied with electric energy; a frame molded with a resin material; and an electrode member formed on the frame by injection molding of an electroconductive resin material. The electrode member includes a supporting portion for supporting the member to be supplied with electric energy and a contact portion to be contacted to a main assembly electric contact, provided in the main assembly, when the cartridge is mounted to the main assembly.