The purpose of the invention is to provide a hydrous adhesive patch wherein the stability of an active ingredient having a given cyclic ketone structure such as loxoprofen is excellent. The hydrous adhesive patch comprising a support and an adhesive layer disposed on the support, wherein the adhesive layer contains an active ingredient comprising a compound having a given cyclic ketone structure, a pharmacologically acceptable salt thereof or a solvate thereof, a nonionic surfactant, and water. The nonionic surfactant preferably has an HLB value of 6.0-9.5 inclusive and is preferably an ethylene oxide adduct-type surfactant, and the number of moles of ethylene oxide added is preferably 5 or less.
