The purpose of this study is to investigate the effect of elementary school teachers' self-efficacy and help network centrality on elementary teacher-teacher trust. To do this, we analyzed social networks and 3-level multilevel models based on the questionnaire data of 184 schools and 484 elementary teachers. As a result, the self-efficacy of elementary school teachers showed a statistically significant effect on teacher-teacher trust with other variables being controlled. In addition, outdegree centrality among elementary school teachers' help networks had a statistically significant effect on teacher-teacher trust but the effect of indegree centrality was not statistically significant.