By this paper, I am for the purpose of considering a position of so-called Fudai Daimyo in relations of the Shogunate for the early modern times, and vassal structure and a power structure of the Tokugawas for the medieval period to the early modern times. For an object, I examine mainly on Tatebayashi/Shirakawa times of the daimyo Sakakibaras who makes the last Tokugawa period Echigo Takada Han. Concretely, the first, I confirm an origin and a position in the whole Tokugawas of the Sakakibaras. The next, I consider a formation process and a characteristic of the Sakakibara’s vassals. For a characteristic in vassal formation of the Sakakibaras, there are not most of the hereditary vassal from the Middle Ages, and to organize the vassal who can call it with O-tsukibito attached to by Ieyasu in the core. It is a characteristic to be seen in specific the Fudai Daimyo vassal formation of the Ii’s and so on, and cannot confirm this with a Tozama Daimyo and Fudai Daimyo of the new collection. And last, I survey a position of Fudai Daimyo in structure and rerations of the Shogunate.