This invention provides the following: a polarizing plate provided with a polarizer layer no more than 20 [mu]m thick, a first protective film laminated to one surface of the polarizer layer with a first adhesive layer made from an active-energy-ray-curable adhesive interposed therebetween, and a second protective film laminated to the other surface of the polarizer layer with a second adhesive layer made from a water-based adhesive interposed therebetween; and a polarizing plate that has a pressure-sensitive adhesive layer, a substrate to which a polarizing plate is bonded, a liquid-crystal display, and an organic electroluminescent display, each of which uses the abovementioned polarizing plate. Preferably, at least one of the protective films has a moisture vapor transmission rate of 1,000 g/m2/day or less.