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Permian radiolarian fossils were discovered from red siliceous mudstone of the North Kitakami Terrane, in the Rikuchu-Seki District, Iwate Prefecture, Japan. This is the first report of Paleozoic radiolarians from the North Kitakami Terrane. Preservation of the radiolarian fossils are bad, because the accretionary complex in the district has been affected by contact metamorphism of Cretaceous granitic rocks. The radiolarian fauna, composed of Pseudoalbaillella sp. cf. Ps. elegans, Ps. sp. cf. Ps. simplex, Ps. sp. cf. Ps. sakmarensis and others, indicates early Early Permian (Asselian -early Sakmarian) in age. It is considered that this radiolaria-bearing red siliceous mudstone was originally overlain by chert and underlain by basaltic rocks in the reconstructed oceanic plate stratigraphy of the Jurassic accretionary complex in Japan.