To provide a device for treatment easy to use, comfortable and capable of manufacturing by a comparatively simple method.

This device for treatment is provided with a cover demarcating a cavity and the cavity is constituted to house a part of a human body. The cover is provided with at least a sheet having a composite structure. The composite structure comprises at least two layers and at least an adhering matrix locating between two layers. At least one of the two layers is permeable to a solvent, and the two layers are permanently adhered to the adhering matrix. The adhering matrix includes at least a kind of activator soluble in a solvent. The activator is emitted at least one side of the cover when the activator is dissolved in the solvent.