The purpose of this study was to investigate the effects of organization citizenship behavior of casino employees and organization commitment, organization commitment and customer orientation, organization citizenship behavior and customer orientation. In order to analyze data of this study, a questionnaire survey was conducted with employees of casino in Gangwon-do. This study considers organization citizenship behavior of casino employees and examines the method of enhancement of organization citizenship behavior, organization commitment and customer orientation for development of casino industry. The results of the study were as follows. First, organization citizenship behavior had a statistically significant effect on citizenship, sportsmanship. Second, organization commitment had a statistically significant effect on customer orientation. Third, altruism and sportsmanship had statistically significant effects on customer orientation, citizenship had a statistically significant effect on satisfaction of customer need, conscientious action had a statistically significant effect on customer reception service.