This study was intended to examine an inter-relationship between a casino employee's internal marketing and job performance and to investigate how the employment status(regular and non-regular employee) role in the inter-relationship between the internal marketing and job performance. In executing this study, employees who worked in 4 foreigner casinos located in metropolitan areas were selected as a mother population. Then, a questionnaire survey was conducted for above employees for one month in June 2007. effective 388 copies of questionnaires were used for an analysis. Collected data for this study were analyzed using SPSS/PC+ WIN 12.0. The results of analyses were as follows: ⑴ Two internal marketing factors(clear role, management policy support) have a significant relationship with job performance's job achievement. ⑵ In case of non-regular employees, two internal marketing factors(clear role, management policy support) have a significant relationship with job performance's contribution or achievement. ⑶ In case of the regular employees, four internal marketing factors(clear role, welfare support, communication and the management policy support) have a significant relationship with the contribution or achievement and the self-efficacy of job performance factors.