The saponin constituents in various kinds of soybeans: cultivated in several Prefectures in Japan, imported from USA, Canada, and China, and black soybean cultivated in Hyogo Prefecture in Japan, were investigated and soyasaponins I, II, III, A1, and A2 were characterized from all kinds of soybeans. Soyasaponins in imported soybeans and black soybean are more or less acetylated and this makes the TLC of soyasaponins from these soybeans rather complicated. In order to clarify the soyasaponin contents in various kinds of soybeans and soybean products, the quantitative analysis method for soyasaponins has been developed by means of GLC.