The excavation of a so-called 'Roman villa' near Tarquinia in central Italy was started in 1992. Prof. M. Aoyagi of Tokyo University is taking charge of whole excavation work. The site is ca. 50 m apart from the sea shore of Tyrrhenian Sea. In the season of 1992, approximately 200m^2 was uncovered, and a trefoiled room of a building was discovered. The floor level of the building is ca. 1.4m deep from the surface and the wall stands up around lm from the floor. Traces of mosaic were also found on the floor, but only fragments have remaind. The date of the building is still vague, but most expectedly around from the 4th century A.D from the stvle of pottery.