The present invention provides a low-cost method for production of isoglucose comprising indigestible dextrin with a high value of use in foods and beverages. This method comprises the following step (A) and at least one of the subsequent steps (B) and (C). (A) steps of acting glucoamylase on pyrodextrin comprising digestion-resistant components and hydrolyzing the digestible components in glucose, (B) step of adding fructose, (C) step of converting a portion of the glucose produced into fructose by means of glucose isomerase.