Behcet's Syndrome consists of an association of the oral aphthae with recurrent ulcer on the external genitals, and with iridocyclitis and hypopyon, forming the so-called tripple syndrome. Sometimes, only two of the three manifestations are present. Recently, the authors have experienced a case of aphthous lesion in the oral mucous membrane and iridocyclitis with hypopyon. This paper was written for the purpose of reporting the case and reviewing literatures on this subject.