Objectives: We performed cost-benefit analysis to investigate the benefit of companies dispensary. Methods: We measured the cost and benefit of running a factory dispensary. This study focused on a factory with well arranged professional health-care staff. The study was carried out during 1995-1997. All the past values of cost and benefit were converted into present value. We used net benefit and cost/benefit ratio as determinants. Results: The net benefit of the object factory dispensary was -73,000,000 Won, and cost/benefit ratio was about 0.65. This result showed no profitability. Conclusion: There would be limitation of generalization because this study included only one factory dispensary. As we did not consider many indirect benefits. The benefit portion might be underestimated. We should also think about the possibility of profitability. If one dispensary takes charge of two or more factories. Then it can produce sufficient profit. With all of those efforts we dream the days of healthy workers will come.