According to the official survey, the working hour for rice production per unit area is quite different in every farm management. This is because various factors of farm management are effecting the work processes of rice production. From the view point of our studies, these factors can be classified into two groups: one of them is the economic conditions surrounding the outside of farm management and the other is the inside conditions of farm management. Therefore, this report will be limitted only to the analysis of the latter conditions, especially of the next three, i.e., farm scale, field situation (parcellment of fields) and construction of family. As a matter of fact, our effort is devoted to clearing up of the relationship between working hour for rice production per unit area and the above mentioned three factors effecting the labor use. Our results obtained from the same basic data that were utilized in previous report, are as follows: 1) The more the area of cultivated land per farm increases, the more the working hour for rice production per unit area is decreases. More over when the area of cultivated land in above relationship is calculated by the area of one working man, this relationship becomes clearer. 2) The more the number of field lots or plots per farm increases, the more the working hour for rice production per unit area becomes longer. But, if we adopt the number of field lots or plots per unit area in above relationship instead of that per farm, this relationship becomes more proportionate. 3) It is also proved that the same relationship is existing, between the working hour per unit area for rice production and the number of family member per farm that is to say, the increase of working hour is partly caused by the increasing of working Persons of the farm which results the rising of labor input per unit area for rice production. These results seem to express not only the special feature of family farm, but also of Asiatic small farm. Thus, it becomes very important to apply these results for "labor simplification" in our small family farm.