Abstract
On the distribution of roomsise in Japan classified by the number of rooms, there is the minimum ratio in dwellings of 2 or 3 rooms, and it's grade is very small especially in public rental dwellings. The 58% of all our dwellings are under 6 tatami (≒9.5m^2) per one room, and in public rental dwellings, it up to 85%, (in the case of 3-room public rental dwellings, it shows 98%). Japanese average number of rooms is 3.82 per one dwelling, this ratio is not so small in comparison with the other advanced nations, but it's standard deviation (1.9 rooms) is comparatively largest one. Such tendencies may be caused either by difference of the measurement method of each units, or by the existing large gap between the upper and the lower, or both. I hope the uniformity of the measurement for the international comparison in such study. There is no difinition of lower limit in the research of Japanese dwelling room areas.
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