The present invention relates to a spirometry device, in which a respiratory tube is installed. There is a housing on the side of the respiratory tract. This housing is provided with an electronic circuit. This electronic circuit is connected with a piezoelectric plate. The piezoelectric plate extends from the housing in the direction of the breathing tube, and the piezoelectric plate is located in the area through which the breathing tube air flows. When the person who is being measured or inspected bites one end of the respiratory tract, or if he breathes forcefully into the respiratory tract, the piezoelectric plate in the respiratory duct is large in the air flow coming out of the respiratory tract. As less, different deformation amounts can be produced.;A constant ratio relationship is established between the amount of deformation passing through the piezoelectric plate and the voltage. After calculation processing of the electronic circuit which has passed the relative voltage of this deformation amount, that is, the numerical value of the spirometry amount of a measurement test | inspection can be known correctly.
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