In Japan, rice farming was influenced by the liberalization of the minimum access to rice trading. Because of this problem, the Japanese government promotes the improvement of the productivities of rice production. In the regions where large-scale farms aren't found, community-based group farming based on rural community is expected as a model of farming. In Japanese local areas. rural communities have been the basic units not only of social life but also of farming work. Group farming is an activity based on the rural community aiming to reconstruct rice production through co-operation of agricultural machinery, joint operation.