| abstract |
The present invention provides a laminated film that can be used as a filter, having both strength that does not break due to pressure during filtration and a good filtration rate. A thin film having a first hole portion having a thickness of 1 nm to 1 μm and having one or more holes, and a second hole portion having a thickness of 1 to 100 μm and having one or more holes. In the laminated film in which the supporting film is laminated, the average aspect ratio of the holes included in the thin film is set to 2 or less, the opening ratio of the thin film is set to 80% or less, the first hole part of the thin film, and the second hole of the supporting film The parts are arranged so as to satisfy a predetermined relationship. [Selection] Figure 1 |