The paper traces the transfiguration process and the structure of three-storied wooden architecture in Shukubo of Shinshu Zenkoji-temple. Each of three-storied Shukubo was two-storied or one-storied, and site was not filled with architectures like present at the beginning of completed in Meiji period. Each of three-storied Shukubo came up with three-storied by extension to the upstairs existent architecture, that is “Tsumimashi”. There were Shikigeta structure at one of the structure that arose in the transfiguration by “Tsumimashi”. Shikigeta structure is structure that was built beams on existent beams, and pillars of up floor and down floor were fixed to each of beams.
