This study shows the necessity of internal marketing activities and the need for effective internal marketing programs for fashion shop. This research tests the hypothesized relationships between internal marketing and its determinants such as job satisfaction, organizational commitment, and customer orientation. To measure these hypotheses, a total 200 questionnaires were distributed and 185 were collected. Finally, 163 questionnaires were used for the analysis, while 22 were found invalid. The frequency analysis, factor analysis, reliability analysis, and multiple regression were conducted after coding and cleaning by SPSS 18.0. The internal marketing activities were classified into five factors (internal communication, welfare system, empowerment, educational training program, and incentive system). The results of this study are as follow. First, internal marketing activities have a positive influence on job satisfaction and organizational commitment. Second, job satisfaction has an effect on organizational commitment. Third, internal marketing activities, job satisfaction, and organizational commitment have a positive influence on customer orientation. Accordingly, it should raise the standard of customer orientation, if it is promote the job satisfaction and organizational commitment of employee through internal marketing activities such as internal communication and empowerment.