The present invention relates to a mouthpiece for endoscope and, more specifically, to a mouthpiece for endoscope which: can be seated and fixated well on the mouth and teeth of a patient during endoscopic examination； enables saliva collected in the mouth of the patient to be discharged easily； and enables the smooth supply of oxygen and the smooth discharge of carbon. The mouthpiece for endoscope according to an embodiment of the present invention includes: a main body unit which is formed to be supported on the surrounding part of a patient and has a penetration hole in the center； a body unit which is fixated by being bitten by the mouth of the patient by being formed on the rear side of the main body unit and has a support member having a cross section of an oval shape； an endoscope guide unit which guides the insertion of an endoscope by being extended from the lower part of the body unit and limits the movement of tongue； and a saliva discharge inducing unit which has a discharge inducing pipe of a cylindrical shape having a saliva discharge hole in one side of the main body unit to be extended to the mouth of the patient and has a structure which can discharge saliva collected in the mouth to the outside through the discharge inducing pipe. The body unit is bitten safely by the mouth of a patient by forming: a plurality of cut grooves of a curved line shape which is same as the teeth alignment in the upper and lower parts of the support member； a locking step unit protruding at a predetermined height to prevent separation from teeth in the upper and lower parts of the end of the support member； and a mouth rear side support unit having a wing shape to support the rear side of the mouth of the patient in both sides of the support member.본 발명은 내시경용 마우스피스에 관한 것으로서, 더욱 상세하게는 내시경 검사시 환자의 입술 및 치아로 잘 안착 고정되게 하고 환자의 입안에 고이는 침을 용이하게 배출되게 하며 산소 공급 및 탄소 배출이 원활하게 이루어지게 하기 위한 내시경용 마우스피스에 관한 것이다.본 발명의 일실시 예에 따른 내시경용 마우스피스는 환자의 입 주변에 지지될 수 있도록 이루어지고 그 중앙에 관통홀이 형성된 본체부와,
