A defibrillator disclosed in the present application including at least: a high voltage capacitor charged through a battery power source； a ladder bridge circuit connected to one end of the high voltage capacitor； a control unit for controlling an on/off operation of switching elements constituting the ladder bridge circuit, wherein the ladder bridge circuit comprises: a first circuit unit and a second circuit unit, one ends of which are connected to one end of the high voltage capacitor and which are connected in parallel to each other； and a third circuit unit connected in series to the other ends of the first circuit unit and the second circuit unit.
