To provide a plasma display panel of improving a discharge time-lag.A plasma display panel of the present invention is characterized in that it comprises a pair of substrate assemblies opposed to each other sandwiching discharge spaces formed to seal a discharge gas therein, wherein one of the pair of substrate assemblies comprises: display electrodes arranged on a substrate; a dielectric layer for covering the display electrodes; and a protective layer for covering the dielectric layer, and the protective layer is configured so that a plurality of MgO single crystals are adhered to an MgO film in such a manner that crystal orientations of the plurality of MgO single crystals are aligned in one direction.