Seven prenylated flavonoids and two pterocarpans together with a saponin were isolated from the roots of Echinosophora koreensis. They were identical with echinoisosophoranone, echinoisoflavanone, isosophoranone, sophoraisoflavanone A, kenusanone C, kenusanone A, sophoraflavanone D, 4-hydroxy-3-methoxy-(6aR,11aR)-8,9-methylenedioxy-pterocarpans, (-)-maackiain, and $3-O-{alpha}-L-rhamnopyranosyl(1{ ightarrow}2)-{eta}-D-galactopyranosyl(1{ ightarrow}2)-{eta}-D-glucuronopyranosyl$ kuzusapogenol A. Among them, a pterocarpan, 4-hydroxy-3-methoxy-(6aR,11aR)-8,9-methylenedioxypterocarpan, and a saponin, $3-O-{alpha}-L-rhamnopyranosyl(1{ ightarrow}2)-{eta}- D-galactopyranosyl(l{ ightarrow}2)-{eta}-D-glucuronopyranosyl$ kuzusapogenol A, were isolated for the first time from this plant.