The purpose of this study was to identify factors influencing marine officers’ job satisfaction as an indirect measure of health in order to verify the health of Korean marine officers’ working in a special environment of ship. With the managers those who deeply linked with marine officers’ job, the mediating relationship between marine officers’ job satisfaction and fatigue was examined via fun leadership of sea captains. Study subjects were 291 marine officers’ working for a South Korean company. To analyze the data, frequency, mean, and standard deviation were computed, and one-way ANOVA, t-test, and correlational analysis (Pearson correlation) were conducted. Additionally, Sobel test was performed to test for statistical significance of the mediating effect of fatigue, The results showed that the higher the fun leadership of a sea captain, the higher the job satisfaction (r=-.300, p<.001) and the lower the perceived fatigue (r=-.228, p<.001) in marine officers’ whose work life activities are confined to the space of a ship. Fun leadership influenced marine technician s job satisfaction, and fatigue was a mediator. Therefore, it is required to increase their job satisfaction to prevent accidents on ship and mange marine officers’ health. Moreover, to manage job satisfaction, it is important for sea captains to demonstrate fun leadership to help marine officers’ reduce fatigue.