As the first fascicle in a serial paper concerning tabulate coral assemblage of the Naidaijin Formation in Kumamoto Prefecture, Kyushu Island, Southwest Japan, the present study describes favositines including three favositoids, Klaamannipora densitabulata sp. nov., Pseudofavosites asoensis sp. nov. and Sparsisolenia? sp. indet., and five pachyporoids, Gracilopora delicata sp. nov., Hillaepora sp. indet., Parastriatopora sp. indet., Thamnopora miyamotoi sp. nov. and Thamnoptychia tanimotoi sp. nov. Judging from a close relationship between T. miyamotoi and an index coral, T. nicholsoni, the fauna is Givetian (late Middle Devonian) in age. This is the first full description of the Devonian tabulate corals from the Kurosegawa Belt.