Stratospheric ozone depletion caused by emission of chemicals including chlorofluorocarbon (CFCs) is one of the global environmental problems. Vienna Convention adopted in 1985 and Montreal Protocol on Substances that Deplete the Ozone Layer (Montreal pact) adopted in 1987 oblige participant nations to regulate production of chemicals including CFCs (ozone-depleting substance) in order for all nations to cooperate in protecting the ozone layer. Japan has enacted Law Concerning the Protection of the Ozone Layer and launched measures to suppress emission of ozone-depleting substance, rationalization of its usage, and regulate its production based on the law. Additionally, Japan has adopted Vienna Convention and Montreal pact. This paper intends to analyze the policymaking process leading to the enactment of Law Concerning the
Protection of the Ozone Layer. Additionally, because it is pointed out that Chemical Substances Control Law enacted in 1973 has influenced on discussion on Law Concerning the Protection of the Ozone Layer, authors try to analyze the significance of Chemical Substances Control Law in Japanese environmental policy.