Knowledge Creation Theory derived from research on new product development of Japanese companies in the 1980s, and then it has evolved widely as methodology as well as models of knowledge management and knowledge-based management. The evidence-based research of SECI process was indispensable during this evolution. Recently, companies are increasingly recognizing the importance of "innovation management" as managerial challenge. Needless to say, the core of innovation is knowledge creation process. These interests are expanding to open innovation and "societal innovation". In this article, a model of knowledge creation for "social enterprise" is discussed, as a future corporate form beyond the boundaries of firms.