In this paper, I tried to make an economic analysis on the relationship between the farm house-hold class dissolution and technological progress in agriculture, by using production function analysis for two rural districts, Chikugo in Fukuoka Prefecture and Saga in Saga Prefecture. The results of analysis show that the sums of parameters in Cobb=Douglas production functions are constant one and production functions follow the low of constant return to scale, which mean that there are no differences in production efficiency among different size of farms. In Chikugo and Saga districts, the farm house-hold dissolution does not appear in stable pattern, but rather unstable. Fundamentally, this is due to the fact that the technology of rice production does not stay at the equilibrium point because there is no difference in the production efficiency between various size of farms. Scale economic advantage does not exist under the present situation where the farm size is less than 3.0 hectares of land. And the complete system of large-scale mechanization such as combines and large tractors can not be established without scale advantage.
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