The structure of miyaginin previously reported as p-vinylphenyl O-d-xylosyl-(1→6)-d-glucoside without stereochemical assignment of two glycosidic linkages was reinvestigated by spectral and chemical means and shown to be revised as p-allylphenyl O-β-d-xylopyranosyl-(1→6)-β-d-glucopyranoside (p-allylphenyl β-primeveroside). In order to confirm the revised structure, an unambiguous synthesis of miyaginin was performed.