The Social Cognitive Career Model proposes that career interests arise from beliefs about capability to execute a course of activity (self-efficacy), and beliefs about the consequences of performing particular activities (outcome expectations). In our study, 301 Japanese university students were given questionnaires including the Vocational Preference Inventory and scales assessing Career Self-efficacy and Career-outcome Expectations. Hierarchical multiple regression analyses indicated both self-efficacy and outcome expectations were significantly related to vocational interests. Outcome expectations accounted for significant incremental variance in explaining interests across six of Holland's vocational environments. Implications of social cognitive theory for career development and interventions among Japanese university students are discussed.