PROBLEM TO BE SOLVED: To provide a film for patch support, which has both drug barrier property and extensibility while suppressing labor and cost during production, a laminate using the same, and a patch. SOLUTION: This is a patch support film 1 made of a resin having a drug barrier property. Since the entire film is formed in a undulating shape in the thickness direction, it has a concavo-convex structure 12 in which concave portions 12A and convex portions 12B are repeated along the surface. The top of the protrusion 12B and the bottom of the recess 12A each have a flat cross section. The film thickness of the patch support film 1 is 5 μm or more and 150 μm or less. The height difference H between the concave portion and the convex portion is larger than the film thickness of the patch support film 1. [Selection diagram] Figure 1【課題】製造時の手間やコストを抑えつつ、薬剤バリア性と伸び性を両立した貼付剤支持体用フィルム、これを用いた積層体及び貼付剤を提供する。【解決手段】薬剤バリア性を有する樹脂からなる貼付剤支持体用フィルム１である。フィルム全体が厚さ方向にうねった形状に構成されることで、面に沿って凹部１２Ａと凸部１２Ｂを繰り返す凹凸構造１２を有す。凸部１２Ｂの頂部及び凹部１２Ａの底部は、それぞれ断面平坦形状となっている。貼付剤支持体用フィルム１の膜厚が５μｍ以上１５０μｍ以下である。凹部と凸部との高低差Ｈが、貼付剤支持体用フィルム１の膜厚よりも大きい。【選択図】図１
