This study investigates the influence of policy-related factors on the intention to keep working among mothers with children under 12 years old, especially focusing on the differences between the mothers with preschool children and elementary school children. The study also considers the individual, family, job characteristics of mothers with children, in order to draw the specific impact of policy factors. Data was collected through e-mails from 500 working mothers living in urban area, and 489 interview data were finally utilized in analyses. The results of analyses show that the level of awareness on work-family balancing policy significantly influences on the intention to keep working among mothers with preschool children. On the contrary, there is no statistically significant policy-related factors influencing on the intention to keep working among mothers with elementary school children. Both studies and social polices excessively focused on the mothers with preschool children in terms of work-family balancing issues. Working mothers with elementary school children have not been spot-lighted as beneficiaries from social policy, even though elementary school children also should be cared by others after school. Effective social services assisting work-family balance among mothers with preschool children should be more developed.