This study investigated the relationship of fashion brand SNS characteristics, relationship quality (satisfaction, trust, and commitment) and purchase intention. The study focused on Facebook and also examined the difference between fashion involvement groups. This study targeted consumers who have used fashion brand Facebook and are aged between 20s and 30s. Data collection was conducted through surveys, and a total 205 questionnaires were collected for the final statistical analysis. The major findings of the study were as follows. First, three characteristics of fashion brand SNS, which were entertainment, interactivity, and providing information, influenced positively on SNS users' satisfaction. Entertainment had the greatest influence on satisfaction, and providing information and interactivity followed. Second, satisfaction for fashion brand SNS influenced positively on trust and commitment. Also, trust to fashion brand SNS demonstrated a positive influence on commitment. Third, trust and commitment on fashion brand SNS both influenced positively on purchase intention. Fourth, the fashion involvement groups showed differences in fashion brand SNS characteristics, relationship quality, and purchase intention. The high involvement group showed much higher results in all aspects then did the low involvement group. Based on the above results, this study has a significant value which suggests directions for future research. Also, this paper is expected to provide managerial implications to fashion companies which need to develop SNS marketing strategies.