This study aimed to find out the characteristics of the career exploration profiles of middle school students through analyzing the relationship between different types of career exploration, personality factors(16PF), and career decision-making self-efficacy. Also, it investigated why each students carry different profiles from others. With six types of career exploration, Realistic, Investigative, Artistic, Social, Enterprising, and Conventional, they were interpreted by the combination of code 1, 2, or 3. However, when all of the six types were found out high or low, cluster analysis has been performed to see which types really were the ones, in case of students with multiple types. Moreover, the study also tried to find the group characteristics-which personality factor affected the differences between groups-by discriminant analysis and the meaningful differences in career decision-making self-efficacy between five groups. I conducted the tests of career exploration, 16PF, and self-efficacy on 273 middle school students. With the result of tests, I organized the data, and did correlation studies, cluster analysis, discriminant analysis, variance analysis, and post analysis using SPSS program. Five groups, defined by the profiles for different types of career exploration, were named accordingly: Multi-Interst, RIA salient, ASE salient, R salient, and Narrow-Interest. There were significant differences in personality factors in the order of rule-consciousness, social boldness, and sensitivity between five profile groups. There were also meaningful differences in career decision-making self-efficacy between five groups.