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The purpose of this study is to examine effects of justice, specifically procedural and interactional justice, on social identity and organizational commitment. It also analyze the mediating role of social identity on the relationship between employees' perceived procedural justice and organizational commitment. An empirical study conducted with 720 employees at 11 hotel restaurants found that social identity had a significant positive relations procedural justice and interactional justice. social identity had positive relation to organizational commitment. Finally, the results also indicated that social identity played mediating roles in the relationship between procedural justice and organizational commitment. All findings from this empirical research above-mentioned provide implication that procedural and interactional justice should be manage well, particularly social identity must be stress carefully in order to enhance organizational commitment.In the food service industry, where competition intensifies daily, various family restaurants should constantly research the change of customer trend. In particular, women recently become the main customer of the food service industry. Therefore, it is necessary to investigate their lifestyle and charac-teristics of purchasing behavior.