Purpose:To achieve tobacco control, it is necessary for internationally established scientific knowledge to be reflected in concrete measures. However, in Japan, only Kanagawa prefecture, Hyogo prefecture, and Bibai city Hokkaido have enacted ordinances for the prevention of exposure to second-hand smoke. This study aimed to elucidate factors associated with ordinance enactment as well as appropriate measures to be enacted, based on analysis of the process of examining the ordinance. Methods:We reviewed policy documents from six prefectures (Kanagawa, Hyogo, Tokyo, Osaka, Yamagata, and Chiba) where ordinance investigative commissions have been established. They included the minutes of the conference on tobacco control of each municipality, conference materials, etc. Also, we interviewed the stakeholders related to tobacco control. Result:The analysis indicated (1) numerical target achievement levels of each local government’s second-hand smoke measures, regional characteristics and the intentions of chiefs as factors associated with installation of the commission; (2) the appointment of the Chair from an appropriate medical field and consultation with a congress during the process of preparing the ordinance as a factor allowing the conclusion to be drawn that the establishment of the ordinance was necessary in review meetings; and (3) the impact of political decisions by lawmakers such as political affiliations, election support groups, public opinion and personal preferences as factors affecting the propriety of parliament deliberation. Conclusion:In order to enact an ordinance, it seems necessary to spread models derived from the precedents to other municipalities using the evidence obtained as effects of regulations, to create drafts of the ordinance by the commission including consultation with a congress, to lobby lawmakers, and to foster positive and proactive public opinion. Ahead of the Tokyo Olympics in 2020, while the national level of these laws and regulations are being considered, it is necessary to take adequate measures.