This paper is based on a study on the functions of the nurse, as a member of the multiprofessional team, in one Psychiatric Hospital. The populations interviewed was composed of 16 nurses, 17 phisicians, 7 social workers, 3 occupational therapists and 3 psychologists. The results showed that not even the nurses had a clear idea of their functions. The author's conclusions emphasize the need of a good undergraduate program on Psychiatric Nursing and on continuing education.