To provide a drying bag which is used with a futon drying machine to dry the inside and the outside of the futon simultaneously and to have a function to dry the futon and exterminate ticks effectively.

The drying bag is used with the futon drying machine, wherein an article (2) to introduce hot air into an accessary bag of the futon drying machine and the drying bag simultaneously is attached to a hot air introducing aperture of the futon drying machine and an article (3) which improves gas permeability between the lower futon and the bottom surface of the drying bag is disposed or may not be disposed according to the material quality of the drying bag.