The purpose of this paper is to analyze the changes of department structures in Japanese Private Universities between 2000-2015. Size and departmental organization of all education and childcare as well as engineering school/colleges were analyzed. Generally colleges of education and childcare field expanded their size due to big demands for teachers and childcare workers. It was found that organizational structure were influenced mainly by the location of the institutions. Engineering schools in metropolitan areas expanded their size and number of departments. Smaller colleges/schools in provincial areas tended to changes their structures more. They decreased their capacity of engineering schools and created new schools/colleges other than engineering more. These results imply the strong influence of the demographic factors and the selectivity of the institutions. Prospect of provincial colleges/schools are discussed.本研究は，科学研究費助成金基盤研究(C)「社会変動と教育研究組織の再構築」（平成25-27年度）の成果の一部である
