An electrophotographic image forming apparatus to which a cartridge is detachably mountable for forming an image on a recording medium, said cartridge comprising an electric power supplied member (108, 110, 190, 191), and a cartridge electrical contact member (141, 160, 188, 189) having a cartridge electrical contact (141a, 160a, 188a, 189a), said electrophotographic image forming apparatus comprising: a main body electrical contact member (144, 161, 163, 164) having a main body electrical contact (144a, 161a, 163a, 164a) electrically connectable to said cartridge electrical contact (141a, 160a, 188a, 189a) in order to supply electric power to said electric power supplied member (108, 110, 190, 191) when said cartridge is mounted on an apparatus main body of said electrophotographic image forming apparatus, said main body electrical contact (144a, 161a, 163a, 164a) being movable relative to said apparatus main body, and an electrical contact cover member (151, 153, 154) for covering said main body electrical contact member (144, 161, 163, 164), wherein in operative association with an operation of mounting said cartridge on said apparatus main body, said electrical contact cover member (151, 153, 154) is moved relative to said main body electrical contact member (144, 161, 163, 164), characterized in that said electrical contact cover member (151, 153, 154) has an exposed portion (151a, 153a, 154a), which exposes said main body electrical contact (144a, 161a, 163a, 164a) to the outside of the electrical contact cover member (151, 153, 154), said electrical contact cover member (151, 153, 154) is attached to said main body electrical contact member (144, 161, 163, 164) to relatively move said exposed portion (151a, 153a, 154a) along said main body electrical contact member (144, 161, 163, 164), and wherein in operative association with the operation of mounting said cartridge on said apparatus main body, said cartridge electrical contact (141a, 160a, 188a, 189a) and said main body electrical contact (144a, 161a, 163a, 164a) are electrically connected together in said exposed portion (151a, 153a, 154a). a main body electrical contact member (144, 161, 163, 164) having a main body electrical contact (144a, 161a, 163a, 164a) electrically connectable to said cartridge electrical contact (141a, 160a, 188a, 189a) in order to supply electric power to said electric power supplied member (108, 110, 190, 191) when said cartridge is mounted on an apparatus main body of said electrophotographic image forming apparatus, said main body electrical contact (144a, 161a, 163a, 164a) being movable relative to said apparatus main body, and an electrical contact cover member (151, 153, 154) for covering said main body electrical contact member (144, 161, 163, 164), wherein in operative association with an operation of mounting said cartridge on said apparatus main body, said electrical contact cover member (151, 153, 154) is moved relative to said main body electrical contact member (144, 161, 163, 164), characterized in that said electrical contact cover member (151, 153, 154) has an exposed portion (151a, 153a, 154a), which exposes said main body electrical contact (144a, 161a, 163a, 164a) to the outside of the electrical contact cover member (151, 153, 154), said electrical contact cover member (151, 153, 154) is attached to said main body electrical contact member (144, 161, 163, 164) to relatively move said exposed portion (151a, 153a, 154a) along said main body electrical contact member (144, 161, 163, 164), and wherein in operative association with the operation of mounting said cartridge on said apparatus main body, said cartridge electrical contact (141a, 160a, 188a, 189a) and said main body electrical contact (144a, 161a, 163a, 164a) are electrically connected together in said exposed portion (151a, 153a, 154a).