A plasma display panel (PDP) including a front substrate (110) and a rear substrate (120) facing each other, a partition wall (124) interposed between the front substrate and the rear substrate to define a plurality of unit cells (S), each unit cell including a main discharge space (SP), an auxiliary discharge space (S1), and a step space (S2), the auxiliary discharge space and the step space being on opposite sides of the main discharge space along a stepped sidewall of the partition wall (124), pairs of scanning and sustain electrodes (X,Y) arranged adjacent the auxiliary discharge spaces and to the step spaces, respectively, address electrodes (122) extending to cross the scanning electrodes at a location adjacent to the auxiliary discharge spaces, a phosphor layer (125) formed at least in the main discharge spaces, and discharge gas filling the unit cell.