With the development of information technology, the market situation is changing more rapidly than ever. The change is most rapid in the preferences and lifestyle of consumers. For companies to survive in such an environment, it is indispensable to develop innovative and competitive new products by better understanding the needs of consumers. Any novel and meaningful idea of a new product basically originates from knowledge, which plays an important role in the performance of new products because it is the most valuable asset for a business entity. In this study, the author considers the knowledge sharing process as a dynamic aspect based on the term “knowledge,” carrying a static meaning as used in the existing research. The nature of the knowledge sharing process pertaining to new product development has been largely divided into three terms and then re-established. The author focuses on a new product development team as the subject of sharing and providing knowledge on new products, and regards the solution to problems that may arise in the development process as the stability of the team. The moderating effect was examined by the relationship between the type of knowledge sharing process and the outcome of the new product with the variable of team stability. The results indicate that the convergence and similarity of the knowledge sharing process affect new product performance as positive variables, whereas the tacitness of the knowledge sharing process does not lead to a significant result in terms of performance of new products. This study also shows that the stability of the team has a positively direct effect on the outcome of the new product. Thus, the convergence process of various kinds of knowledge positively affects the diversity and innovation of new product concepts. Moreover, the same recognition area or shared goal awareness and sense of responsibility play important roles in the performance of the new product. The moderating effect of team stability between the type of knowledge sharing process and new product performance is described in the convergence and tacitness of the knowledge sharing process. In the process of merging existing knowledge with new knowledge or sharing embedded knowledge in the members with, the activity wherein the members of the NPD team communicate and collaborate with each other over a long period of time will provide opportunity to improve the performance of the new product. The purpose of this paper is to examine the relationship between the type of knowledge sharing process, the stability of the team, and new product performance. Academic and managerial implications and the directions for future research are discussed as well.