An adhesive skin patch comprising a support layer and an adhesive layer, wherein: the adhesive layer contains a mixture of a pharmaceutically acceptable acid addition salt of ropinirole with potassium hydrogen carbonate； and the mixture contains at least one member selected from the group consisting of ropinirole and a pharmaceutically acceptable acid addition salt thereof and potassium hydrogen carbonate.本發明係一種貼附劑，其係具備支持體層及黏著劑層者， 上述黏著劑層含有羅匹尼洛之藥學上可容許之酸加成鹽與碳酸氫鉀之混合物， 上述混合物含有選自由羅匹尼洛及其藥學上可容許之酸加成鹽所組成之群中之至少1種、以及碳酸氫鉀。
