In the present invention, one or more water-soluble resin layers and one or more polylactic acid-based resin layers are laminated on at least one surface of a base film, the thickness of the water-soluble resin layer is 0.1 to 15 μm, and the polylactic acid-based resin Provided is a laminated film having a layer thickness of 10 to 500 nm. With such a configuration, the water-soluble resin layer and the polylactic acid-based resin layer can be easily peeled off from the base film, and are excellent in followability, adhesion, and coverage with respect to an adherend that is flexible and curved, It is excellent in compatibility with organs such as internal organs, and it is possible to obtain an optimal laminated film as a skin external preparation such as a wound dressing, an adhesion preventing agent, and a skin care product.本発明は、基材フィルムの少なくとも片面に水溶性樹脂層とポリ乳酸系樹脂層とが各１層以上積層され、水溶性樹脂層の厚みが０．１～１５μｍであり、かつポリ乳酸系樹脂層の厚みが１０～５００ｎｍであることを特徴とする積層フィルムを提供する。このような構成により、基材フィルムから水溶性樹脂層とポリ乳酸系樹脂層を容易に剥離でき、柔軟かつ曲面である被着体に対する追随性、密着性、被覆性に優れ、また、皮膚、内臓等の臓器などへの適合性に優れており、創傷被覆剤、癒着防止剤、スキンケア用品などの皮膚外用剤として最適な積層フィルムを得ることができる。
