A respiratory auxiliary device includes a first conduit provided with a pair of nasal prongs and having two opposite end portions, two second conduits connected fluidly and respectively to the end portions, and a pressure-measuring pipe adapted for connection with a pressure-measuring device. One of the second conduits is adapted for discharging air exhaled by a patient. The other one of the second conduits is adapted to be connected to an air supply device. The pressure-measuring pipe is disposed within said one of the second conduits, and has one end extending into the first conduit in proximity to the nasal prongs.
