A respiratory tract widening tool capable of reliably managing a respiratory tract in a supine posture and freely changing the posture, and a respiratory tract widening unit provided therewith are provided. The respiratory tract widening tool (1) is a respiratory tract widening tool used attached to an outer periphery of the neck of the human body and is provided with a main body (2) that comes into contact with the posterior side of the neck when the tool is worn and receives an upward external force in a supine posture and a pair of jaw retainers (3a, 3b) that extend forward from the main body (2) spaced apart by a distance equivalent to the diameter of the neck and come into contact with both sides of the lower jaw when the tool is worn. The main body (2) and jaw retainers (3a, 3b) are formed of a restorable member, the main body (2) and jaw retainer (3a,3b) deform, when the posture is changed from the supine posture, in conformity with the posture, and when the supine posture is set, the external force received by the main body (2) is made to act on the jaw retainers (3a, 3b) to retain the lower jaw at a height at which the respiratory tract can be managed.
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