Naoto Kimura joined Tokyo Metro's predecessor, Teito Rapid Transit Authority, in 1984. In his early career, he gained experience in formulating the business plan, as well as rolling stock planning. After becoming Deputy Manager from March 1995, his posts included work in railway business planning, operation planning, as well as financing and related business. During this period he was involved in developing related business strategies in preparation for privatization. Naoto Kimura became a Manager in the Personnel Department in March 2003, and was engaged in recruitment and human resources. He began working in International Affairs in April 2008 and was promoted to Director of International Affairs in 2010.