This research aims to obtain a clearer picture of how PBL can be implemented effectively in social studies learning in elementary schools, and can provide input for educational policy makers in formulating policies that support the implementation of innovative learning models and in accordance with dynamic curriculum demands. This research uses a quantitative approach with a quasi-experimental design. This approach was chosen because it is suitable for measuring the effectiveness of implementing the Project-Based Learning (PBL) learning model in improving student learning outcomes in Social Sciences (IPS) subjects. The research results show that the t test results show that the calculated t value (4.321) is greater than the t table (2.001) with a p-value 0.05. Meanwhile, the results of critical thinking, collaboration and creativity skills experienced a significant increase after implementing PBL, with an average increase of 16.7 to 17.9 points. This indicates that there is a statistically significant difference between the learning outcomes of students who use the PBL model and those who use conventional learning methods. Therefore, it can be concluded that the PBL learning model is more effective in improving students' social studies learning outcomes.