Tanabeceras nakagawaense sp. nov. is described from the lower part of the middle Cenomanian (Cunningtoniceras takahashii Zone, Upper Cretaceous) in the Nakagawa area, Hokkaido, northern Japan. This new taxon is characterized by having the most compressed shell among all species assigned to Tanabeceras, and it also represents the youngest taxon of the genus. The stratigraphic distribution of Tanabeceras in Hokkaido suggests that the genus migrated from the Tethyan realm to the Northwest Pacific region during late Albian, evolved and radiated regionally during the late Albian to early middle Cenomanian, and then became extinct during late middle Cenomanian time.