Normative concepts are said to lead to controversial discussions and involve indefinite and valuable elements, unlike other concepts. Although we have to elucidate these concepts (such as justice, equality, and freedom) in the philosophy of law, we do not know how to discuss these matters rationally. In order to solve this problem, legal philosophers, especially those in Japan, have widely accepted the distinction between concept and conception used by John Rawls and Ronald Dworkin. If this distinction applies to the concept of justice, it leads to problems with theories of justice and with the methodology of these theories. Additionally, if this applies to the concept of law, it is connected with problems of jurisprudence. I doubt this dis...