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Eastern Shimane Prefecture is underlain mainly by Paleogene granitoids, which constitute a northern part of the largest granitic batholith of the Inner Zone of Southwest Japan (Fig. 1). These granitoids intrude into the basement with the Hida metamorphic and Sangun metamorphic rocks overlain by Paleozoic and Mesozoic sedimentary and coeval volcanic rocks, then by terrestrial volcanic rocks of late Cretaceous to Paleogene ages. These must have been happened along continental margin of East Asia before the spreading of the Japan Sea in Miocene time. Therefore, the granitic magmatism must have occurred along continental rifting in a northeast direction. The region became a type locality for magnetiteseries granitoids by finding high contents of opaque oxides and high bulk Fe2O3/FeO ratio of the granitoids (Ishihara, 1971a), while those of the Sanyo tungsten province contain no magnetite with low bulk Fe2O3/FeO ratios. It is also most important region for historical iron-sand mining and molybdenum–quartz vein mining in Japan. Largest three (Higashiyama, Seikyu and Daito) and the fifth (Komaki) molybdenite deposits, all in vein type, are hosted in various leucocratic granites and the Kawai mingled rocks of this region. Geology of these granitoids and associated molybdenite deposits were studied in 1950-60s, and the results including major and minor chemistry of the granitoids were published in 1971 (Ishihara, 1971b). The major elements were analyzed by wet methods and the minor elements were determined by spectrographic methods Chemical compositions of the Paleogene granitoids of eastern Shimane Prefecture, Sanin District, Southwest Japan