Involved in the complex social and political processes, the evolution of a new subject is a battlefield in where different groups struggle for resources, position, prestige, and subjective identity. The 'integrative studies' curriculum of the new learning guidelines established in 1998 in Japan is also the result of the negotiations, struggles, and compromises reached among different curriculum ideologies, such as the progressive, neo-liberalism, neo-conservatism, and the Left. After its implementation in 2002, the integrative studies faced many problems and predicaments. Some assert that integrative studies on the whole are the main reason why Japanese students' literacy has been reduced. To continue with or to abolish the use of integrative studies thus becomes a critical debate in Japan. Although the new learning guidelines announced in 2008 do not abolish the integrative studies curriculum, the teaching hours devoted to such studies have been reduced to two lessons per week. In short, this paper aims to analyze the social and political functions of the curriculum of the integrative studies through the discussions of the implementation of it and its roles in the curriculum policies of neo-liberalism and neo-conservatism perspectives.