Actionomyces israelii and Eikenella corrodens were isolated from the pleural effusion of a 69 year o1d male suspected of pulmonary tuberculosis. Acid fast bacillus was not found from any clinical specimens, thereby the case was considered one of the rare forms of actinomycosis accompanied by E. corrodens. Studies were made on the morphologies, cultural characters and biochemical reactions and identification of the isolates were made on the basis of the results. The identifications of A. israelii and E. corrodens were confirmed by J. M. Slack and by R. E. Weaver, respectively.