This product is used to maintain a relaxed state of the partient when opening the river above the endoscopy. Existing band has been sold or used without sterilization separately from the mouthpiece. In this conection, due to the preparation of band in addition to the mouthpiece for endoscopy and due to unsterilized use of band, A band is likely to be contarinated by the parient's secretion during endoscopy. But, as its own elasticity has to be maintained, it is difficult to sterilized the band. Under such situation, even though the band should be replaced for each patient, bacteria and virus in parient's secretion. it is used several times and contaminated by various.