In this study I investigated the developing proces of the old town houses in basin of Nara. particularly pointing the changes of structure. This result of this study can be given below: 1) The old town houses in the first term of eighteen century (except for the houses in old streets in Nara prefecture) are the same system as the farm houses in structures supporting the roofs, and the plan like this also don't change much in comparison with the farm houses. 2) After the middle term of eighteen century, some Nando disappeared soon, the plane structures setting up the Zashiki at the back were brought, and the tendency with many decoration of the Zashiki was noticed remarkably, This fact forms a remarkable contrast with the old houses in basin of Nara keeping the space of Nando in nineteen century. 3) Until the first term of nineteen century, on the other hand, the system common to the farm houses was followed to the structure system, and any structual changes were not realized in the meantime. 4) They already utilized the second floor as a Tsushi (a lumber room) since seventeen century. The striking development of the second floor were not noticed till the first term of nineteen century, in addition, a Tsushi at the second floor was only used partially because of the limitation on structures. 5) Since nineteen century, the old houses had new structure system which mainly use Dosashi. Going with the changes of this structure system, the old houses had the rooms at the second floor, and in Meiji period they had the Zashiki there. 6) But these developing processe were realized notably in the town houses having the type of Rokumadori (six rooms plan type). Conversely, the second floor developed lately, and the structures also didn't change in Meiji period. The town houses having the type of Yomadori (four rooms plan type) followed to the farmful pattern of houses for a long time in recent times. I understood that the obvious differences could be found by changing the plane form in the developing process as the town houses.
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