An electrode structure of a plasma display panel (PDP) is disclosed. The electrode structure is formed on a front substrate of the PDP. The electrode structure includes a first sustaining electrode, a second sustaining electrode, and an auxiliary electrode. The first and second sustaining electrodes are formed on the substrate with a first gap existing therebetween. The auxiliary electrode is formed in the first gap. A second gap is formed between the auxiliary electrode and the second sustaining electrode. The second gap is smaller than the first gap.