The purpose of this research was to investigate the effect of professional soccer team's social responsibility on team image, team identification, relationship quality, and team loyalty. A total of 374 out of 400 spectators who visited in professional soccer Hyundai Oilbank K-league 2011 were selected by convenience sampling as subject for this study, except 26 with unfaithful reponses. We confirmed the goodness of fit test of the model, utilizing SPSSWIN Ver. 15.0 after which we tested each hypothesis. The results were as follows; First, it was shown that legal and philanthropic sub-factor of professional soccer team's social responsibility had significant influence on the team image. Second, it was shown that team image had significant influence on the team identification. Third, it was shown that team identification had significant influence on the relationship quality. Forth, the relationship quality had significant influence on the team loyalty. Fifth, it was shown that economic, legal and philanthropic sub-factor of the professional soccer team's social responsibility had significant influence on the team loyalty.