A Plasma Display Panel (PDP) with improved luminous efficiency includes: a rear substrate; a front substrate facing the rear substrate; a plurality of barrier ribs interposed between the front and rear substrates and partitioning a plurality of discharge cells; a plurality of sustain electrode pairs arranged separate from each other on the front substrate facing the rear substrate, each pair of sustain electrodes including an X electrode and an Y electrode; and a front dielectric layer covering the sustain electrode pairs and having at least two grooves in each of the discharge cells; a distance between the X and Y electrodes of each sustain electrode pair is greater than a height of the barrier ribs.