Basic regulatory values for tritium as well as other radionuclides are given in the Japanese “Law concerning Prevention from Radiation Hazards due to Radioisotopes”. In this law the regulatory standards on radiation safety are fundamentally based on the ICRP Recommendations. Annual limits on intake (ALIs), derived air concentrations (DACs) and release limits are provided in the law for tritium both in elemental and oxide forms. Detailed guides for radiation protection including radiation monitoring are stipulated in each establishment. Rules on health, safety and environment for tritium protection in Japan will be presented and discussed.