Disclosed is an endoscope aid that enables the elimination of smoke and regulation of pressure in the portion that is being arranged by an endoscope. The endoscope aid (1) is an aid that can be used in various procedures, and is provided with an outer tube (20) that is inserted into a body, an inner tube (30) inserted into the outer tube (20), a holder unit (40), and a de-aeration prevention unit (50). The outer tube (20) has auxiliary tubes (23, 24), and the de-aeration prevention unit (50) is provided with a vent valve (57), and these are appropriately connected to an automatic air supply device or air removal device, maintaining the air pressure in the body and eliminating smoke generated by surgery.
