This study aimed at investigating the effect of the implementation of mind mapping learning method to the students' social science achievement viewed from learning interest at the fourth grade students of SD Sathya Sai in the academic year of 2012/2013. This study was a quasi-experimental research which applied the posttest-only control group design involving 42 students of grade four at SD Sathya Sai who were selected by using total sample sampling technique. The data of the students' social science achievement and learning interest were collected and then analyzed by using the Analysis of Covariance (Anacova). The result of this study showed that the students' social science achievement who were treated with mind mapping learning method was higher compared to the students' social science achievement of those treated with conventional learning method. This difference was consistent even though the students' learning interest had been controlled.