From the Japanese rhubarb, "Shinshu Daio, " two new naphthalene glycosides, I, mp 150-152°, [α] D-119.0°, C₂₀H₂₄O₉·H₂O and II, [α] D-102.0°, C₂₂H₂₄O₁₂·3 1/2H₂O were isolated together with 6-hydroxymusizin 8-O-β-D-glucopyranoside which was found to be identical with the one isolated from aphid, Aphis nerii. By the chemical and spectral evidences, the structures of I and II were characterized to be torachrysone 8-O-β-D-glucopyranoside and torachrysone 8-O-β-D-(6'-O-oxalyl)-glucopyranoside, respectively.