The Japanese government provided various political opportunities for non-governmental groups and individuals in Japan to "jointly propose" policy on education and sustainable development at the World Summit on Sustainable Development, Johannesburg, 2002. These opportunities resulted in the emergence of the Japanese education for sustainable development (ESD) movement, and the crystallisation of a broader proposal that led to the initiation of the UN Decade of ESD (2005-2014). In this paper, we trace the history of these two outcomes, arguing that the opportunities, developed through the coordination of non-governmental groups by government, took place within, rather than broadened or confronted, the government's scope of interests. While the paper illustrates how the government's continued support was crucial to the development of the ESD movement and the UN Decade, and the movement has met with considerable achievements thus far (via its collective challenges to conventional education in a sustainability context in Japan), we argue that recognition of the political opportunity structures that affect the movement's further development remains crucial. In particular, we argue for close attention to the significance of a corporatist framing of this emerging civil society movement in Japan by the national government, and call for further political and historical analysis of ESD movements and their relations with government, around the world. (Contains 10 notes.)