Endotracheal intubation support instrument (100) comprises: a main body section (10) having flexibility； a handle section (60) and a blade section (20) extending from both sides of the main body section (10) respectively； and a U-shaped groove (40) running through the main body section (10) from the handle section (60) to the blade section (20) and allowing a flexible tube of a bronchial fiber to come in and out freely. The blade section (20) comprises: a flap (22) for subsuming all or a part of larynx of a patient； and a lifting body (30) having, on each bank of the U-shape groove (40), a first protruding portion (31) allowed to contact with a peripheral portion of a epiglottis of the patient and a second protruding portion (32) provided nest to a main body section side of the first protruding portion (31) and allowed to contact with a peripheral portion of a glossal root of the patient.
