The purpose of this study was to examine how parents' achievement pressure affects children's happiness, and to examine the mediating effects of children's ego resilience and media device addiction in the relationship between parents' achievement pressure and children's happiness. To this end, the data of 1,393 people from the 12th (2019) Korean Children's Panel data of the Childcare Policy Research Institute were used. For data analysis, Cronbach's α, frequency and percentage, average analysis, correlation analysis, multiple regression analysis, three-step regression analysis, and Sobel test were performed using the SPSS 26.0 program. As a result of the study, first, parental achievement pressure was a factor that negatively affected children's happiness, and the higher the level of parental achievement pressure, the lower the child's happiness. Second, it was found that there was a partial mediating effect of children's self-resilience in the effect of parents' achievement pressure on children's happiness. Third, it was found that there was a partial mediating effect of children's addiction to media devices in the effect of parents' achievement pressure on children's happiness. Through this study, it was found that parents' achievement pressure negatively affects children's happiness, and in this relationship, children's high self-resilience has a positive partial mediating effect on children's happiness, and children's high media addiction has a negative partial mediating effect on children's happiness. These results are significant in that they give implications for important variables to consider when planning programs to improve children's happiness in the future