A plasma television set includes a detection disabling circuit including a dividing resistance having one of two ends to which a constant voltage is supplied from an outside of the sustain voltage generation circuit and the other end which is grounded, the dividing resistance having a dividing point, and a diode having an anode connected to the dividing point of the second dividing resistance and a cathode connected to a dividing point of another dividing resistance, and a substitute voltage stop circuit including a resistance to which the predetermined starting voltage is supplied, an electrolytic capacitor having a positive electrode connected to the resistance and a negative electrode grounded, and a transistor having a base connected to the positive electrode of the electrolytic capacitor, an emitter grounded and a collector connected to the dividing point of the second dividing resistance.