An excision device configured to excise living tissue by ejecting liquid toward the living tissue includes: a liquid supplying unit configured to supply liquid to be ejected a liquid chamber configured to be filled with the supplied liquid an ejection nozzle connected to the liquid chamber a drive member configured to be deformed in the direction to reduce the volume of the liquid chamber when a drive voltage is applied more than a case where the drive voltage is not applied a liquid ejecting unit configured to eject the liquid in the liquid chamber in a pulsed manner from the ejection nozzle by applying the drive voltage to the drive member in a state in which the liquid chamber is filled with the supplied liquid and an air-bubble detecting unit configured to detect air bubbles in the liquid chamber by detecting an electric current flowing in the drive member when the drive voltage is applied to the drive member.
