This study was undertaken in order to reveal the historical process and technical characters of the joint technology in timber frame structures in Japanese traditional house. These joint technologies called shikuchi in Japanese. This study puts in focus on horizontal member used in Japanese traditional house, called sashimono, and analyzes these shikuchi joint to pillars of framework in Early Modern houses, it reveals these historical changes and some local characteristics. In this study, defined 13 joint elements, we analyzed the sashimono joint that has been described in the restoration report on early modern house in western Japan.