This paper treats of the description of the Fusulina sp. A which is the representative species of the Carboniferous Fusulina sp. A fauna discovered from the Ippaimizu area of the northeastern part of the Taishaku Limestone in Hiroshima Prefecture. The fauna is able to correlate with the Fusulina faunas described from Kyushu, Shikoku and central Japan, and its geologic age is thought to be Late Moscovian (Late Desmoinesian).