Abstract
The member of "tatami" in dwelling rooms of dwelling houses, is used as a measure of the size of living area of dwelling houses in Japan. The "tsubo" is a general measuring unit of land or building areas. And area of one "tsubo" equals two "tatami", it is about 3.3m^2. Both of them are used in statistical reports or researches on housing problem in Japan. Analysing the distributions of the correlations between "tsubo" and "tatami", indicated in several statistics and researches, it is shown that the average ratio of living spaces in dwelling units is 50% of total floor areas, inexclusive use for dwelling, but its variations and deflexions, influenced by grade of areas, localities, kind of structures, tenure of dwellings or standaligations, have very varions type. Especially, the increasing trend of living space-ratio in small units, recognized by this analysis, is the important matter in the present Japanese urban housing problem.
