At least an electrode of a first electrode group and at least an electrode of a second electrode group are formed in a region nearer to one edge portion of a substrate than to a center of the substrate in a longer-side direction of the substrate, and the electrode that is nearest to the second electrode group in the longer-side direction among the first electrode group formed in the region nearer to the one edge portion and the second electrode group are provided with a space between the electrode and the second electrode group.