An endoscope insertion aid of the present invention includes a tube body that is inserted into an entrance of an intestinal tract and held by an intestinal wall, a passage hole through which an insertion portion of an endoscope can pass, the endoscope having an insertion path through which a guide wire can pass and a fixing unit that fixes, with the insertion portion passed through the passage hole, a distal end portion of the guide wire protruding from an opening on a distal end side of the insertion portion to the tube body.
