A pressure-sensitive adhesive sheet according to the present invention includes a base including a metal layer, a first plastic film layer A, and a second plastic film layer B and a pressure-sensitive adhesive layer on a surface of the second plastic film B. The metal layer is positioned between the first plastic film layer A and the second plastic film layer B. The metal layer has a thickness of 2 μm to 15 μm. A total of a thickness Ta of the first plastic film layer A and a thickness Tb of the second plastic film layer B is within a range of 25 μm to 70 μm.