PDP (1) includes front plate (2) and rear plate (10). Front plate (2) has protective layer (9). Rear plate (10) has phosphor layers (15). Protective layer (9) includes a first metal oxide and a second metal oxide. In X-ray diffraction analysis, a peak of a base layer lies between a first peak of the first metal oxide and a second peak of the second metal oxide. The first and second metal oxides are two selected from the group consisting of MgO, CaO, SrO, and BaO. A peak desorption temperature of CO2 gas from protective layer (9) is less than 480° C.