A cover material-equipped patch comprising: a patch and a cover material, wherein the patch comprises a support layer and a drug reservoir layer which is stacked on one surface of the support layer and which contains a drug and a drug reservoir base agent, the cover material comprises a cover layer and an adhesive layer which is stacked on one surface of the cover layer and which contains an adhesive base agent, the patch and the cover material are arranged in such a manner that the adhesive layer is stacked on another surface of the support layer, and a solubility parameter (SPa) of the drug, a solubility parameter (SPb) of the drug reservoir base agent, and a solubility parameter (SPc) of the adhesive base agent simultaneously satisfy conditions represented by the following formulae (1) to (3): 0 ‰¤ SPa ˆ’ SPb ‰¤ 1.5 2.0 ‰¤ SPa ˆ’ SPc ‰¤ 2.8 and 1.0 ‰¤ SPb ˆ’ SPc ‰¤ 2.8
