Today, teachers are required to play a new role suitable for the new age, and the professional community is emerging as a key for enhancing teachers' collective expertise. This study sought to confirm the effect of the core elements of the professional community on the improvement of teachers’ teaching and learning efficacy. For this purpose, a two-level hierarchical linear model was analyzed for 3,463 teachers who responded to the teacher questionnaire in the 9th wave data from the Gyeonggi Education Panel Study(GEPS). As a result of the study, even after controlling the school level differences, cooperation among teachers, a key characteristic of the professional community, had a significant positive effect on enhancing teachers’ teaching and learning efficacy. The effects of distributed leadership, such as principal leadership and teacher leadership, were not significant, suggesting that the core elements of the professional community, a, such as cooperation and trust, cannot be seen in all schools, and that teaching and learning efficacy can be improved based on current school satisfaction. These findings are meaningful in that highlighted the professional community as a starting point to discover the potential of individual students, emphasize the role of teachers as subjects that will bring innovation to schools and education, and enhance teachers' collective expertise.