[en] Review is given to the present status and the future problems of nuclear fuel cycle in Japan. As the introduction, the concept of nuclear fuel cycle from uranium mining to fuel reprocessing and radioactive waste disposal, is explained. The uranium requirement for the projected nuclear plants in Japan for future ten years is explained. The world-wide supply and demand of uranium, escalating uranium price, and the development of domestic resources are also discussed. As for uranium enrichment, the national developmental project by gas centrifuge process and the international cooperation are the main subjects. As for fuel fabrication, three japanese suppliers of the fuel for light water reactors are introduced. The necessity of various services including the repair, reassembling and inspection of irradiated fuel, and the software techniques for fuel management are discussed as the future problem. As for the reprocessing of spent fuel, the PNC's 210 ton/year plant is not sufficient, and the need for the second plant is emphasized. Reprocessing situation in other countries is also explained. The problems associated with the transportation of spent fuel are also discussed. As for the utilization of plutonium, the problems and the present status of the utilization of plutonium for LWRs and the fuel fabrication are presented. (Aoki, K.)