Fruits of Rubus coreanum (Korean name: Bog-bun-ja) have been used in oriental traditional medicine as the remedies for impotence, pollution, premature ejaculation and frequency of urination etc. It is known to have phenolic compounds as an astringent. By means of chromatographic methods, four hydrolyzable tannins were isolated from the fruits of R. coreanum. The structures of these compounds were established as gallic acid, 2,3(S)-HHDP-D-glucopyranose, sanguiin H-4 and sanguiin H-6 on the basis of physicochemical and spectroscopic evidences.