This study is to explore the relationship between leadership, job satisfaction, and job performance in a gaming machine manufacture with social support as moderating variable which is to test whether there is moderating effect causing by social support between leadership and job satisfaction. This study subject is 125 employees from gaming machine manufacture in Taiwan. The results reveal that leadership has significant positive impact on job satisfaction; job satisfaction has significant positive impact on job performance and social support has no moderating effect between leadership and job satisfaction.