To develop a cyclodextrin-containing air spray which forms a water-insoluble cyclodextrin-containing coating film by a simple application operation such as spray to allow continuous exertion of various functions of cyclodextrin such as deodorization.

An application material of cyclodextrin aqueous solution, or a water-insoluble coating film including cyclodextrin and polypeptide can be formed by spraying or the like by adding and mixing polypeptide, particularly, gelatin or collagen to the aqueous solution and allowing the resulting mixture to stand for a fixed period or more.