Adhesive sheet for attachment to skin and percutaneous absorption preparation using same

The invention provides an adhesive sheet for skin, which shows sufficient adhesiveness to the skin and causes low skin irritation. The adhesive sheet contains an adhesive layer formed on a support, in which the adhesive layer contains at least a thermoplastic elastomer, a non-volatile hydrocarbon oil, and polyisobutylene, but no tackifier. The polyisobutylene is a medium molecular weight polyisobutylene with a viscosity average molecular weight of more than 100,000 and not more than 500,000. The invention also provides a percutaneous absorption preparation containing a drug or a pharmaceutically acceptable salt thereof in an adhesive layer of the inventive adhesive sheet for skin.