In this study, we analyze how the gendered gap in childcare time has changed by the family policy in Korea using the Time Use Survey (TUS) data from the two-year points (i.e., 2009 and 2019). We first classify households according to their income and educational level, and then apply the Oaxaca-Blinder Decomposition method to carefully examine the differences between high and low classes of households. Our findings are mainly threefold. First, the changes in family policy (i.e. pursuing gender equality) had a significant effect on the gendered gap in childcare time; household inequality caused by educational factors was likely to disappear, whereas the effects of household income decreased. Second, the aforementioned effects were greater in 2019 compared to 2009. We assume this is because mothers have been able to gain more resources, while fathers could accumulate experiences of housework including childcare during the chosen decade. Third, the outcomes of decomposition, however, reveal that the gendered gap was still high in low-income households despite the family policy. On top of that, high-income mothers tended to take more burden than before. Based on the findings, we argue that there is still an urgent need to encourage fathers’ engagement in housework, and that household income should be a critical concern in making family policy.