Provided is a fermented food extract that has a blood pressure-lowering action and is useful as a functional health food or pharmaceutical composition. This fermented food extract is obtained by: subjecting a fermented food, preferably a fermented fagopyrum esculentum lyophilisate, to acetone extraction； eluting the fermented fagopyrum esculentum acetone extract using a solid phase extract cartridge filled with a resin to which a phenyl group is bonded, with formic acid-containing water used as an eluent； and fractionating and purifying the eluate using a column (PFP column) filled with a carrier to which a pentafluorophenyl group is bonded, with formic acid/methanol-containing water used as a mobile phase. This functional health food or pharmaceutical composition contains said extract or at least a part thereof as an active ingredient.
