Row electrodes X, Y have bus electrodes Xb, Yb extending in the row direction and a plurality of transparent electrodes Xa, Xa′, Ya, Ya′ extending in the column direction, arranged along the bus electrodes Xb, Yb and connected to the bus electrodes Xb, Yb with intersecting. Each end of the transparent electrodes Xa, Xa′, Ya, Ya′ of one of the row electrodes X, Y and each end of the corresponding transparent electrodes Xa, Xa′, Ya, Ya′ of the other are opposed to each other with a discharge gap g in between. Discharge cells C, C′ are formed in a discharge space between a front glass substrate 10 and a back glass substrate 13, opposing the transparent electrodes Xa, Xa′, Ya, Ya′, which form pairs by opposing each other.