The purpose of this paper is to consider the relation between architectural composition of onari halls and the order of onari ceremonies in early Edo era, by means of a casestudy of Tokugawa Iemitsu's and Hidetada's onaris to Shimadzu establishment in 1630. The onari halls in Shimazu establishment consisted of Hiroma, Onari shoin, Tea house and two gates called Onari gate and Tea garden gate, and the whole architectural composition was commonly observed in other onari halls of early Edo era. But Iemitsu and Hidetada passed through the tea garden gate to enter and leave the establishment and thus didn't use the onari gate, because the order of the ceremony began with tea ceremony. Since the whole architectural composition was planned on the assumption that Shogun or Ogosyo would pass through the onari gate, this result leads to the conclusion that the architectural composition had not fitted the order of the ceremony.