Purpose: The purpose of this study was to explore the opportunities, grounds and, consequence of elementary
school teachers' trust formation or hinderance in their peer. Method: In order to accomplish this, the data was
gathered through the interviews with ten elementary school teachers. Theses data were analyzed the content
analysis method and it can be summed up as follows. Results: For the formation and the development of trust
in peer, teachers require the opportunities of interaction at work and certain period of time working together in
the same school. Moreover trust in peers results from both the trust toward educational activities and humanities
of their colleagues. Once teachers assure themselves of their trust in peers, they would share their personal lives
with other teachers, manage their work efficiently and could improve their school life. However, there is some
hinderance in trust formation process such as one's selfishness, discordance between words and actions, too much
divulgence and negligence on colleagues' willingness to educational improvement. The lack of trust among peers
can cause one's unnecessary energy loss and extra stress from troubles in school life. Conclusion: On the basis of
these findings, we can understand that the formation of trust in peers is influenced by direct and indirect
factors. Also, the result can contribute to building more reliable relationships with peer teachers through the
understanding of the multiple factors of cognitive, affective and behavioral aspect behind the trust formation process.