Because the chief headman system of the Himeji clan has a big scale, we cannot elucidate the characteristic of the system only by analyzing the administration by a chief headman in one district. Therefore, it is necessary for us to analyze the administration by chief headmen in districts as many as possible at this stage. We must be able to elucidate the characteristic of the chief headman system of the Himeji clan in the future by doing so. With such a thought, I took the Miki family as an example of chief headmen in this article and clarified part of the duties. In addition, I paid attention to the relations between the chief headman and the assistant of the chief headman, and mentioned that the chief headman system might change in quality and that it might show that the fief rule by the Himeji clan changed in quality in the later part of the early modern period.