A plasma display apparatus is provided that includes a front substrate, a first electrode, a second electrode and a dielectric layer formed on the front substrate, a rear substrate faced with the front substrate, a third electrode formed on the rear substrate, and a barrier rib which is formed on the rear substrate and partitions discharge cells, wherein at least one of the first electrode and the second electrode is formed with one layer, and the width of at least one of barrier ribs which partitions the discharge cells in the outside of an effective display region is wider than the width of barrier ribs which partition the discharge cells in the inside of the effective display region. The plasma display apparatus does not include a transparent electrode consisting of ITO, reducing the manufacturing cost of the plasma display panel. Further, by forming projecting electrodes protruded in the direction of the center of the discharge cell or in the opposite direction of the center of the discharge cell from the scan electrode or the sustain electrode line, the firing voltage can be lowered and the discharge diffusion efficiency of the discharge cell increased.