By artificially sending vibrations to the lungs and airways, the mucus attached to the airways can be fluidized to facilitate the operation of a breathing sound device to facilitate its discharge, and to be easy to carry. The breathing sound device 1 includes a housing 10 having a hollow 11 and a mouthpiece 20 having a vent 21 communicating with the hollow 11. The housing 10 has a reflective end 12 that reflects the air blown from the mouthpiece 20 and an open end 13 through which air blown from the mouthpiece 20 escapes. When a sudden exhalation, such as coughing, is blown into the housing 10 through the mouthpiece 20, noise from the exhalation is resonated with the cavity of the oral cavity and lower airway, and the low frequency acoustic shock wave generated therein causes the user's lungs to Vibrates the airways.
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