This study aims to verify the simple mediating effects and sequential dual mediating effects of the self-esteem and peer attachment in the relationship between parental pressure of academic achievement and career maturity. The participants were 1,359 6th graders from the Panel Study on Korean Children. This study analyzed the 13th wave Panel data(2020) by using SPSS and PROCESS macro model 6. The current study employed descriptive statistics, correlation analysis and mediating effect analysis. Results are as follows: Self-esteem and peer attachment showed a indirect effect in the relationship between parental pressure of academic achievement and 6th graders’ career maturity. Also, in the relationship between parental pressure of academic achievement and 6th graders’ career maturity, self-esteem and peer attachment showed sequential mediating effects. These findings suggest that interventions to enhance 6th graders’ career maturity need to focus on improving pressure on academic achievement of parents, students’ self-esteem and peer attachment.