The purpose of this study is to analyze the developmental characteristics and trend between multiple intelligences (MI) and career maturity (CM). To achieve the aim of the study, the total number of 1107 subjects from elementary, middle, and high school was asked to take MI and career maturity test and the results were analyzed. The methodology to analyze the results were independent t-test, ANOVA, and multiple regression analysis. The findings were as followings: Firstly, considering the MI profiles of children and adolescents, intrapersonal intelligence and interpersonal intelligence tend to be high in both parties. Secondly, as the subjects grow older, the weakness in MI profile is inclined to be compensated. Thirdly, the difference between high and low intelligences tends to be decreased while individual difference within each intelligence to be increased. Fourthly, sex-related differences in MI and CM are maintained constantly in every phase as they are getting older. Concerning MI, male students showed their strength in logical-mathematical intelligence whereas female students in musical intelligence. They also acquired higher score in preparation of career, career concern, and information processing than male students in each level of elementary, middle, and high school. Fifthly, CM shows steeper decline in the phase of adolescence than childhood. Lastly, in every stage of the development, MI and CM show positive correlation and MI explains over 35% of CM. All the students showed especially high correlation with intrapersonal intelligence as the factor that influences on their career perception in each level of school.