Naikakufu | Cabinet Office
「世論調査」(Japanese Live Site) | [Public Opinion Poll]
The Prime Minister formally heads this cabinet office, which plays a supportive role in dealing with affairs of the cabinet. This website provides results of polls by the cabinet office from 1947 to the present. The public opinion polls regarding the constitution, “憲法に関する世論調査 ( [Public Opinion Poll on the Constitution])”, between 1956 and 1971 are reachable from this website. The list of all of the surveys by the cabinet office are available here. If you are interested in Japanese constitutional discussion in the context of its security policy and foreign policy, “自衛隊・防衛問題に関する世論調査 ([Public Opinion Poll on the SDF and Security Issues])”, and “外交に関する世論調査 ([Public Opinion on Diplomacy])” may be informative as well.
Shūgiin Kenpō Shinsakai | Commission on the Constitution, House of Representatives
「衆議院憲法審査会ニュース」(Japanese Live Site) | [Newsletter]
A Commission on the Constitution was founded in each of the Houses of Representatives and Councillors in 2007 when the Diet approved the National Referendum Act. Following this Act, the people judge if each constitutional proposal is appropriate or not. The commission on the constitution of the both houses were created as a platform to discuss constitutional drafts and proposals, in addition to general constitutional issues. The commission on the constitution of the House of Representatives regularly releases a newsletter and provides the numbers of inquiries that the commission has accepted for each topic, such as “Legislation for the National Referendum” and “Renunciation of War”. See the chart of the numbers under the section entitled “憲法の広場([Kenpō Plaza])”.
Shushō Kantei | Prime Minister of Japan and His Cabinet (Prime Minister's Official Residence)
Associated with the Foreign Press Center, Kantei published this report in English in 1993. This report examines the Japanese people’s attitude toward state and society. The questions are not directly related to constitutional discussion, but the survey shows the Japanese people’s thoughts on images of Japan and its role in international society. In 1993, Japan struggled to determine its international role, though it had been recognized as an economic world power. Japan was criticized by its allies for providing only money to the Gulf War in 1991. The question of if the Japanese Self-Defense Forces should join its allies or not was being considered. The discussion was fundamentally related to the constitution; Article 9 determines how Japan enacts its collective-defense rights.