This study used a hierarchical regression model to investigate the mediating effect of career decision self-efficacy on the relationship between parental support and career indecision and indecisiveness. The participants of this study were 633 university students in Taiwan. The results revealed that only accurate self-appraisal significantly mediated the relationship between parental emotional support and career indecision regarding unreliable information. The career decision self-efficacy did not mediate the relationship between parental support and career indecision and indecisiveness in most cases.