This study examined the relationships among affinity for social withdrawal, social anxiety, and social self-efficacy based on a cognitive model of social phobia (Clark & Wells, 1995). Undergraduate students (101 males and 145 females) completed a self-report questionnaire assessing affinity for social withdrawal, social anxiety symptoms (fear of social situations, and avoidance of social situations) and social self-efficacy. Covariance structural analysis indicated that fear of social situations was positively associated with affinity for social withdrawal. In contrast, the results did not indicate that avoidance of social situations was associated with affinity for social withdrawal. In addition, the results indicated that social self-efficacy was negatively associated with affinity for social withdrawal via fear of social situations. These results suggest that preventive intervention strategies targeting social self-efficacy might be useful in decreasing affinity for social withdrawal.