Provided is a thin patch having a flexible patch body, an outer layer, and a release layer. The flexible patch body has a waterproof and moisture-permeable layer and an adhesive gel layer. The outer layer is attached on the waterproof and moisture-permeable layer. The outer layer has a left wrapper and a right wrapper which are adjacent to each other. The release layer includes a first release film and a second release film. The first release film includes a release part attached on a side of the adhesive gel layer and a connecting part extending from the release part of the first release film and folded away from the adhesive gel layer. The second release film is attached on a part of the adhesive gel layer and covers a part of the connecting part of the first release film.
