This study aims to: (1) improve the learning outcome and (2) activities of class VIII C, SMP Negeri 2 Kawunganten Cilacap. This study is classroom action research (CAR) consisting of two cycles, each of which consisted of two meetings, using Kemmis & Taggart design. The subject is 35 students of class VIII C, SMP Negeri 2 Kawunganten Cilacap. The data collection techniques used were observation, achievement test, questionnaire, documentation, and field note. The data analysis used the quantitative descriptive analysis. The results are as follows (1) The through of media-aided Problem-Based Learning instructional model in social studies teaching can enchance learning outcomes. (2) There is an increasing mastery of cognitive learning outcome. In the first cycle, it became 60,00%, and in the second cycle, it became 85.71%. (3) There is an increase in students' attitude (affective domain of learning outcome). The average of students' attitude score was 62.20 in cycle I and it became 67.97 in cycle II, or an increase of 5.57 point. (4) There is an increase in students' learning activities; in the first cycle, the average score of students' activities was 3.01 and it became 3.37 in cycle II, or an increase of 0.36 point.