For the studies of ant founa in Mt. Togyusan, we collected 476 colonies in 1986, 1989, and 1 1991. The communities of ants were composed of 4 subfamilies, 22 genera and 44 species. The a ants of Mt. Togyusan consisted of 21 species and 12 genera in Myrmicinae, 20 species of 6 g genera in Formicinae, 4 species of 3 genera in Ponerinae, and 1 species of 1 genera in D Dolichoderinae. The vertical distribution of the ants in Mt. Togyusan was distributed 41 species in 93% of total species at the altitude of 500 m. The upper limit line of vertical distribution was distributed of 5 species included Pacycondyla astutus and Messor aciculatus at the a altitude of 700 m, and 10 species included Ponera japonica, Leptothorax congrus, ,Lasius b brunneus, and Parairechina flaevipes at the altitude of 1000 m.