This study examined the Japanese factors influencing on the formation and development of modern corporate Public Relations means and activities in Korea. It centers on the introduction and acceptance of CIP, corporate Public Relations advertising, house organ in dealing with corporate Public Relations Communication means and corporate philanthropy through corporate foundation, the Public Relations activities of the economic world in case of corporate Public Relations activities. It analyzed the Japanese factors by examining the emphasis of Public Relations activities and the practical use of communication means relating to corporate Public Relations, focusing on the specific character of corporate Public Relations activities. Centering on the area related to corporate Public Relations from the standpoint of historical development, it approached the point at issue selected as the subject of it through comparing the state of things between Korea and Japan. The results show that Japanese influences have been exerted widely on the formation and development of corporate Public Relations means and activities in Korea. However, it leaves no objection that Japan accepted Public Relations theories and practices of the United States, the birthplace and suzerain state of Public Relations, in the beginning and developmental stages. Therefore, U.S. influences cannot be denied in terms of Public Relations in Korea although it was accepted and developed after introduced from Japan.