A plasma display device is provided. The plasma display device may include a plasma display panel (PDP), an upper substrate and a lower substrate, a plurality of scan electrodes and a plurality of sustain electrodes on the upper substrate, a plurality of first barrier ribs on the lower substrate in parallel with the scan electrodes and the sustain electrodes, a plurality of second barrier ribs on the lower substrate, that intersect the first barrier ribs, and are higher than the first barrier ribs, and a plurality of auxiliary electrodes on the upper substrate and overlap the first barrier ribs. Accordingly, the amount of invalid power of a PDP may be reduced by preventing crosstalk from occurring between a pair of sustain electrodes with a barrier rib interposed therebetween.