This study examines the realities and challenges of internationalizing administrative staff in Japanese universities empirically due to the increasing globalization of higher education. The functions and roles of the administrative staff from the policy perspective, with the implementation of mandatory staff development (SD) and reforms to the standards for establishing universities, have been considered. This study attempts to describe the following three aspects: the international nature, working and training overseas experience, and administrative staff's educational background. The open data were obtained from the Japan Society for the Promotion of Science website. The results of revealed that acquired insights can also become useful inputs for developing university policies concerning recruitment guidelines, methods, staff training, and "human capital development" in Japanese universities. This finding contributes to the policy making and SD of the internationalizing administrative staff in various countries in terms of foreign nationality, oversea experience, and educational background.