Purpose : Korea's female labor force participation rate and the proportion of dual-income households are steadily increasing. In 2023, dual-income households with children aged 6 or younger exceeded 50 % for the first time, highlighting the growing childcare burden. Among dual-income couples, wives often experience high levels of fatigue from household chores and childcare, placing working mothers under the dual burden of workplace and parenting stress. This study examines how married working mothers' perceptions of marriage values and satisfaction with their spouse's childcare sharing affect parenting stress, particularly for mothers with infants and toddlers. Methods : Using raw data from the 2021 National Family and Fertility Survey, this study focused on a sample of 374 women from dual-income households with infant and toddler-aged children. Descriptive statistical analysis, reliability analysis, Pearson’s correlation coefficient analysis, and hierarchical regression analysis were conducted using the SPSS Statistics 29.0 program. Results : The main research results are as follows : First, the satisfaction with spousal sharing of childcare was 2.68 points, marital values were 2.61 points, and parenting stress was 3.41 points. Second, the correlation between the main variables showed that parenting stress had a negative correlation with satisfaction with spousal sharing of childcare and marital values. Third, it was found that satisfaction with spousal sharing of childcare (β= -0.353) and marriage values (β= -0.134) had a negative effect on parenting stress, in that order. Conclusion : This study confirmed that satisfaction with a spouse’s childcare sharing and marriage values are factors influencing parenting stress among working mothers with infants and toddlers. Reflecting these findings, a multifaceted and integrated approach is necessary to establish gender-equal parenting roles and foster positive marriage values. To achieve this, individuals, families, communities, the government, and workplaces must collaborate in a coordinated and organic manner.