This study was conducted to verify the mediating effect of should expectation of child’s success in the relationship between mother’s child-based self-worth and psychological control. For model verification, this study conducted a survey of 323 middle-aged mothers living in Busan by using such measures as child-based self-worth, should expectation of child’s success, and psychological control. As a result of analyzing the structural equation model with the AMOS 26.0 program, the direct effect of child-based self-worth on psychological control was significant. As a result of verifying the mediating effect of should expectation of child’s success, the indirect effect of should expectation of child’s success in the relationship between mother’s child-based self-worth and psychological control was statistically significant. This study is significant in that it confirmed the role of parent for child’s success in the process of inducing the psychological control by the parent. Based on the findings, this study provided the limitations of this study and implications for further researches in discussion section.