The article analyzes the evolution of the concept of «trust» in ethical and socio-philosophical thought. It is emphasized that trust is correlated with such concepts as responsibility, integrity, honesty and is directly involved in the formation of a professional reputation. The communicative side of legal work is analyzed, which involves not only the exchange of information, but also the psychological interaction between people, which is directly supported by trust. We look into the role of trust in the realization of the professional activity of a lawyer at various social levels.