Problem to be solved: to provide a laminate support film, a laminate, and a sticking agent used as a support having good drug barrier property and elongation while suppressing labor and labor during manufacturing.The adhesive agent film 1 is made of a resin having a drug barrier property.The adhesive agent support film is formed into a shape in which the entire layer swells in the thickness direction, and has an uneven structure 4 which repeats the concave portion and the convex portion along the surface.In the concavity structure 4, the height difference between the concave portion 2a and the convex portion 2b is larger than the film thickness of the paste support film, and the bottom portion of the concave portion 2a and the top portion of the convex portion 2B are flat portions having a flat cross section.The thickness of the flat portion is in the range of 5. Mu. M to 150. Mu. M or less, and the thickness of the first flat portion which is a flat portion of a flat portion of the flat portion is thinner than the thickness of the second flat portion which is a flat portion other than the first flat portion.The total thickness of the adhesive agent film 1 is in the range of 10. Mu. M to 450. Mu. M.Diagram【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が良好な支持体としての貼付剤支持体フィルム、これを用いた積層体、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フィルム１である。貼付剤支持体フィルムは、層全体が膜厚方向にうねった形状に構成されることで、面に沿って凹部と凸部を繰り返す凹凸構造４を有す。凹凸構造４は、凹部２Ａと凸部２Ｂとの高低差が貼付剤支持体フィルムの膜厚よりも大きく、凹部２Ａの底部及び凸部２Ｂの頂部が、断面平坦な平坦部となっている。平坦部の膜厚は５μｍ以上１５０μｍ以下の範囲で、且つ、平坦部のうちの一部の平坦部である第１の平坦部の膜厚が、第１の平坦部以外の平坦部である第２の平坦部の膜厚より薄い。貼付剤支持体フィルム１の総厚が、１０μｍ以上４５０μｍ以下の範囲である。【選択図】 図１
