An object of the present invention is to improve a distinctive strange taste (particularly bitterness remaining in the mouth) of a conventional low-calorie food or drink, particularly an edible product (a food or drink) having low calories obtained by replacing part or most of the sugar or isomerized sugar to be added by a high-intensity sweetener. Provided are a composition for improving a taste of a high-intensity sweetener, a method of improving a taste of an edible product containing a high-intensity sweetener, and an edible product in which a taste of a high-intensity sweetener is improved, each of which is characterized by containing or using an isomerized sugar and a rare sugar such that the rare sugar is contained or used in an amount of from 1 to 150 parts by mass based on 100 parts by mass of the isomerized sugar.