Objectives: This study examined the mediating effects of children's media device addiction and executive function difficulty in the relationship between maternal parenting behavior and children's school adjustment. Methods: The study sample was 600 elementary school third graders (308 boys, 292 girls) who had participated in the tenth wave of the Panel Study on Korean Children (PSKC). The data were analyzed using Pearson's correlations and structural equation modeling (SEM) with SPSS 21.0 and AMOS 20.0. Results: First, maternal parenting behavior had a significant direct effect on children's school adjustment. Second, maternal parenting behavior had an indirect effect on children's school adjustment through children's media device addiction and executive function difficulty. In other words, when mothers showed higher levels of positive parenting behavior, children tended to have lower levels of media device addiction and executive function difficulty, which, in turn, led to more school adjustment. Conclusion: These results add to a better understanding of the mechanism linking maternal parenting behavior to children's school adjustment and especially emphasize the importance of executive function for children's school adjustment. These findings can serve as an important contribution to future research and practices for promoting children's school adjustment.Keywords: maternal parenting behavior, media device addiction, executive function difficulty, school adjustment 1 , 2 ORCID Hyeong Yeon Kim