To allow the use of a respiration gas source of lower pressure for a respiration aid.

This device is equipped with a tube 4 having at least one auxiliary flow passage 8 for blowing a respiration gas jet to a patient's respiratory organ, and a deflecting means 14b for deflecting the gas jet toward the inside of a main flow passage 5. A ring 36 is laid downstream of the deflecting means 14b in the main flow passage 5 and positioned between the internal wall 15 of the main flow passage 5 and an elliptical pressure zone 18 for separating the external surface space 37 of the main flow passage 5, thereby surrounding the elliptical pressure zone 18.