An endoscope insertion aid capable of preventing deterioration of operability of an endoscope by an endoscopist even when a posture of a patient receiving examination changes. The aid 10 which guides the endoscope to a mouthpiece M held by a mouth of the patient to whom the endoscope is inserted is equipped with a body section 11 equipped with a bent through-hole having an inner diameter capable of inserting the endoscope, and a holding section 15 which fixes the body section 11 so as not to move when the endoscope is inserted to the body section 11. By arranging the body section 11 so that one end opening of the through-hole opposes a through-hole Mh of the mouthpiece M, a shaft S of the endoscope may be inserted to the mouthpiece M held by the patients mouth even when the endoscope is in a position different from the direction the mouth of the patient is facing. By doing so, the endoscopist is capable of operating the endoscope from a given location regardless of the patients posture, it becomes possible to prevent deterioration of operability of the endoscope by the endoscopist by the posture of the patient.
