Abstract
In Jinseki-Kogen-cho, Hiroshima prefecture, there are house registers in the folklore museum of Toyomatsu-son. This study aims to reveal the actual situations of ground plans of farm houses in the second half of 19th century, through the research of this registers and survey on old farm houses which still remain. Mainly, there are two things that have become clear from the study. One is the transition of plan types, from “Nakanoma” type , a composition of a house with a Nakanoma, which has an irori (hearth) as a focal point, to “Tsuzukima(Suite)” type composed of a main room with tokonoma and an anteroom. The fact that the transition had spread gradually from the eastern part of the village to the west, has been revealed too. And both types have had their own ideal images according to which common farm houses were build.