The present invention addresses the problem of providing a method for suppressing the aging of starch without changing any physical properties other than the aging properties of starch, more specifically, without greatly changing the structure of starch. The present invention solves the above problem by providing a method for suppressing the aging of starch characterized by causing a glycosyl trehalose producing enzyme to act on a starch that shows aging properties, and introducing a trehalose structure to a reducing terminal of the starch, thereby lessening the aging properties of the starch than before the introduction of the trehalose structure.本發明係以提供一種無須使澱粉質之老化性以外的物性變化，亦即，無須大幅改變澱粉質之構造，而抑制澱粉質之老化的方法作為課題，藉由提供一種澱粉質之抑制老化的方法而解決上述課題，該澱粉質之抑制老化的方法，其特徵為，藉由於具有老化性之澱粉質中使醣基海藻糖生成酵素發揮作用，於前述澱粉質之還原末端導入海藻糖構造，而使前述澱粉質之老化性比海藻糖構造導入前更降低。
