The present invention provides a patch that is not easily peeled from the skin. The adhesive 1 of the present invention includes: a supporting base 2; and a water-based gel 3 that is laminated on the entire area of one surface of the supporting base 2.本發明提供一種不易自皮膚剝離的貼附劑。本發明的貼附劑1包括:支撐基材2;以及水性凝膠3,於支撐基材2的一個面的整個區域積層。