PROBLEM TO BE SOLVED: To obtain an α-glucosidase inhibitor useful for preventing and improving obesity and diabetes, having high safety by including an edible mushroom or its essence as an active ingredient. ;SOLUTION: This inhibitor comprises an edible mushroom or its essence as an active ingredient. A raw edible mushroom as it is, a dried edible mushroom, dried powder or an extract with a solvent (water, an organic solvent such as alcohols, ethyl acetate, acetone, etc., are used as the solvent), one or both of a mycelium and a fruit body can be used as the edible mushroom. Mushrooms of the family Boletaceae, the family Tricholomataceae, the family Cortinariaceae and the family Hygrophoraceae belonging to the order Agaricales, mushrooms of the family Hydnaceae and the family Clavariaceae belonging to the order Aphyllophorales and mushrooms of the family Phallaceae belonging to the order Phallales are preferable as the mushroom.;COPYRIGHT: (C)2000,JPO
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