To provide an attachment material for a mouthpiece, which can be handled easily, facilitate saliva to be discharged, and alleviate burdens on medical staff and patients.

An attachment material 1 for fixing a mouthpiece, which consists of a base material 21, an adhesive layer 22 made on the side of the base material 21, and a release sheet 23 provided on the other side of the adhesive layer 22, is characterized by providing an opening section 3 at the center of the attachment material 1 in communication with the inside of the mouth and also by providing a saliva discharge section 4 at a position next to the opening section 3 or close to it with some space from it to discharge saliva out of the mouth.