The plasma display apparatus, in which the light emission efficiency is improved, has been disclosed. The fourth electrodes, which extend in the same direction of the first electrodes (X electrode) and the second electrodes (Y electrodes) and are exposed into the discharge space, are provided between the first and the second electrodes where the sustaining discharge is carried out, and when the sustain action is carried out, the fixed voltage between the voltage applied to the first electrode and that applied to the second electrode is applied to the fourth electrode provided between the first and the second electrodes where the sustain action is carried out in order to make the electric field between the first and the second electrodes uniform.