A pressure-sensitive adhesive sheet includes a substrate layer, and a pressure-sensitive adhesive layer disposed on or over at least one side of the substrate layer. The substrate layer includes a metal layer having a thickness of 10 to 80 micro m. The pressure-sensitive adhesive sheet has a total thickness of 100 micro m or less, and has an electric field shielding effect of 20 dB or more and a magnetic field shielding effect of 5 dB or more as measured by the KEC method at a frequency of 100 kHz to 1000 kHz. The pressure-sensitive adhesive sheet is used for securing an internal component of a portable electronic device.

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