The Carboniferous Ichinotani Formation in the Hida Marginal Terrane has lithologic and paleobiogeographic features of a continental margin affinity significantly different from those of the coeval seamountoriginated limestones widely distributed in the Japanese Islands. The fusuline fauna of the former is also different from that of the latter as exemplified by the restricted occurrence of late Moscovian Neostaffella and Hidaella in the former. The occurrence of these two genera is confined to the Podolskian Beedeina lanceolata Zone and are completely absent in the underlying and overlying biozones of the middle part of the Ichinotani Formation. Fusuline species mainly described in this paper are Beedeina lanceolata, Neostaffella umbilicata, Hidaella kameii, and Ozawainella vozhgalica prolific in and almost restricted to the B. lanceolata Zone, and Fusiella hayashii also characteristic and dominant in this zone.