Provided is a transdermal absorption preparation having superior drug skin permeability, which can uniformly disperse the drug in the preparation and maintain the uniform dispersion state of the drug.A transdermal absorption preparation having a plaster layer containing a drug, a polymer and a pH adjuster, in which the aforementioned polymer contains a polymer having a particular glass transition temperature of 30° C.-200° C., and the surface of the plaster layer has a pH of 6.7-10.0.