The purpose of this research was to investigate the relation between final year high school students' career decision-making self-efficacy and attachment styles. The research group consisted of 808 final year students selected at random and receiving high school education in the province of Trabzon, Turkey in the 2013-2014 academic years. Participants completed a Personal Data Form prepared by the researchers, the Career Decision-Making Self-Efficacy Scale in order to measure career decision-making self-efficacy, the Relationship Scales Questionnaire and the BEM Gender role Inventory. Results showed that career decision making efficacy was significantly correlated with the secure and fearful and attachment styles, and career decision making self-efficacy varied according to gender roles. Subjects with masculine and feminine gender roles had greater career decision making self-efficacy than those with indeterminate roles, and those with androgynous roles had greater career making self-efficacy than those with masculine, feminine or indeterminate gender roles.