An accurate evaluation of a production capacity is an important role for production planning in manufacturing industry. The study has been partly done about the fluctuation in the conventional study of the production capacity, but the study of the subordination has been hardly done. Therefore, in this paper, we will devide by the production capacity which is formed into the production subjects to evaluate objectively the differences of between the actual capacity and the designed capacity in manufacturing industry and will suggest production capacity estimation model which is considered the fluctuation and the subordination, the decreasing causes of the production capacity. The weight of fluctuation which is used for the computation of the ratio of fluctuation and the ratio of subordination and the subordination are denoted to the interval number Thus, the production capacity is denoted to the interval numbers. The efficiency of the proposed model will show through the case study.