In the Western, risk studies which have relevance to measurement and assessment of acceptable risk criteria get divided three tendencies of their fundamental orientation and methods. There are risk-objectivism which make an formal- normative approach, and risk-subjectivism which make an psychological-cognitive approach, risk-constructivism which make an cultural-sociological approach. But they have assumed very serious aspect because their acceptable risk criteria justifies the control of government, and therefore degenerated into scientifical means which maximize the efficiency of national crisis management system. In this context with a scientifical discussion on risk- society which was detonated by Beck, the center of research activities changed from acceptable risk criteria to societal constructive conditions of risk. Perrow and Wildavsky, Giddens, Luhmann develop the discussion on risk-society into a societal theory of risk, including risk conflicts between the determinator and the persons concerned.