This study explores the nature of first generation immigrant mothers’ social capital in their involvement in their children’s education in South Korea. The analysis of the qualitative data from in-depth interviews (n=27) and participant observations (n=33) reveals that immigrant mothers’ social capital in the family is rarely used because of the lack of other types of capital in the family, such as economic or cultural capital. However, social capital outside of the family can help them to increase or become an alternative to social capital within the family. Discovering the nature of immigrant mothers’ social capital related to their children’s education, this article uncovers opportunities for intervention for designing policies to support families with immigrant backgrounds.