A fossil Ellobium is recorded for the first time from the uppermost Lower Miocene Tate Sandstone Member of the Kadonosawa Formation in Iwate Prefecture, northeastern Honshu, Japan. The Tate species is comparable with the Recent Ellobium aurisjudae (Linnaeus) living in Indo-Pacific mangrove swamps. This is the northernmost record of the genus in East Asia through the Cenozoic. The occurrence of Ellobium in the member is regarded as new evidence for the presence of mangrove swamps in northeastern Honshu in the latest Early Miocene age.