This paper illustrates the status of the ownership and the occupancy by foreigners at the summer retreat areas in pre-war period Karuizawa. The study endeavours to investigate House Directory, Karuizawa Summer Residents' Association Handbook 1930. About eighty percent of the foreign poeple who have owned and occupied villas in Karuizawa are the missions and delegates to the annual meeting of the Federation of Christian Missions, which had been held from 1894. This intensity of missionaries also atracted secular foreigners and the upper class Japanese. Most of the foreigners have lived aggregatedly in the original residential area such as Atago, Sakuranosawa and Kamanosawa which have been developed until the end of Meiji Era, although the vast areas around them had been developped by the Japanese people lately. We find that the foreigners' dominant inter-personal environment is characteristic of the core area.
