This paper describes microgastropod fossils from the Kasimovian (late Carboniferous) limestone float collected from the Mizuboradani Valley, Fukuji, Okuhida-onsen-gou, Takayama City, Gifu Prefecture, central Japan. The microgastropod assemblage consists of a diversity of larval and/or early juvenile shells and represents late Palaeozoic cosmopolitan taxa, including Euomphalidae, Pleurotomarioidea, Anomphalidae, Naticopsidae, Trachyspiridae, Goniasmatidae, Orthonematidae, Pseudozygopleuridae, Subulitidae, Meekospiridae and Streptacididae. The microgastropod assemblage bears some resemblances to those from the early Carboniferous of New South Wales, Australia, and those from the latest Permian of Guangxi Province, China.