A patch for external use which has a laminate structure comprising a substrateand a pressure-sensitive adhesive layer which contains a styrene/isoprene/styreneblock copolymer as the base and further contains a tackifier resin componentconsisting of a rosin resin and at least one other tackifier resin, a softeningagent consisting of polybutene and liquid paraffin, a fatty acid ester, and fentanyl,characterized in that the weight ratio of the rosin resin to fentanyl is 1 to 5,the weight ratio of the rosin resin to the whole tackifier resin component is 0.1to 0.6, and the tackifier resin component accounts for 30 to 60wt% of the wholepressure-sensitive adhesive layer. The patch is excellent in the permeationof fentanyl through the skin and in storage stability and is lowly irritant tothe skin.
