Provided is a method for producing soyasaponins inexpensively and simply without crushing seeds or plant bodies and without performing organic solvent treatment. The method for producing soyasaponins comprises bringing at least a part of a plant body of a leguminous plant into contact with an aqueous solution while culturing or cultivating the plant body using the aqueous solution； and collecting the aqueous solution or separating soyasaponins from the aqueous solution.
