Disclosed is a suction device. The suction device includes a sensor unit which measures a breathing condition of a patient, a tube unit which is inserted into a bronchus of the patient in order to suck foreign material generated in the bronchus of the patient, when the values measured by the sensor unit exceeds a predetermined reference value, and a control unit which controls to drive the tube unit based on the measured value received from the sensor unit. According to the present invention, there is provided the suction device which is automatically operated by directly determining whether foreign material is generated in the bronchus of the patient.