Disclosed is a transdermally absorbable preparation, in which an adhesive agent produced by crosslinking at least one copolymer is contained in an adhesive layer and the aging period in the production of the adhesive layer can be shortened. The transdermally absorbable preparation comprises a support and an adhesive layer arranged on the support and containing an adhesive agent and a medicinal component. The transdermally absorbable preparation is characterized in that the adhesive agent comprises a resin mixture comprising 100 parts by mass of a specific acrylic copolymer (A) and 0.1 to 30 parts by mass of a specific acrylic copolymer (B) or 0.05 to 2 part(s) by mass of a polyamine compound, and the adhesive layer additionally contains an organic acid.本發明的課題在於提供一種經皮吸收型製劑，其在黏著劑層中含有使1種或2種以上的共聚物交聯而成的黏著劑，且能夠縮短製作該黏著劑層時的熟化期間。本發明的經皮吸收型製劑，其具備：支撐體、及位於此支撐體上且含有黏著劑及藥劑成分的黏著劑層，其特徵在於：前述黏著劑含有由100質量份之特定的丙烯酸系共聚物(A)、及0.1～30質量份之特定的丙烯酸系共聚物(B)或0.05～2質量份之多胺化合物所構成的樹脂混合物，且前述黏著劑層中進而包含有機酸。
