This research is to contribute to understanding the social aspects of the corporate social responsibility (CSR) by analyzing cases of Japanese multinational corporations (MNCs). To achieve the goal, it applies a theoretical framework consisting of an institutional approach. Since the 1990s, in the midst of globalization, ‘supplier code of conduct’ has progressed rapidly as one of CSRs. Here, this article specifically focuses on Japanese MNCs, such as Mizuno, Sony Electronics, Bandai Namco Games, EAON and Shiseido, and examine the strategies of their headquarters which have implemented with the foreign subsidiaries. Especially it highlights how they use the code of conduct, the supply chain management and the registration rate of GRI.