The trachoma virus, Chlamydozoon trachomatis, can be found as epithelial inclusion bodies in conjunctival scraping slides. The morphology of the virus in scraping smears has been well established. However, the morphology of the virus in sections still stands on rather slender experience. Knowledge of the micromorphology of inclusions as obtained by the electron microscope is very limited. Some experiments have been reported on the electron microscopy of this virus. Most of them have been performed, however, with a purified virus. One of us (Y.M.) studied the same subject with Tsutsui and Tanaka in 1952.1It was supposed from the experiment with purified virus that trachoma virus might have microstructures, details of which, however, were not solved by an experiment with purified virus. Electron microscopy of trachoma virus in section thus warranted attention. It was also necessary to carry out this investigation as a basic study of trachoma virus cultivation