This report is about the results of the survey at Fukutomi Village in Saga Prefecture at 1939 and 1944. On the Japanese farmer that male head of the family have governed, it will be needed to research the farm size related not moments of family labours but to family composition. So I grouped all farms at this village as : the normal farmer, part-time farmer and the conscripted farmer for military service?as it was war-time, and I designed the following family types-3 generation couples, 2 generation couples, older, middle, younger couple and so on, and 1 divided the all farms of the 3 groups into these types in order to research the relation of the family composition and the farm size. The results of the static and dynamic observation shows the remarkable relation between them concerning normal farmer, containing the conscripted farmer, but not part-time farmer. In order of generalize of this results, however, we must consider the progress of agricultural all productivity the existence of part-time farmers and the condition of the land market etc.