There is provided a laminated film that is usable as a filter and has the strength high enough to withstand the pressure applied in filtration without breaking and a good filtration rate. A laminated film comprising a thin film and a support film stacked on top of each other, the thin film having a thickness of 1 nm to 1 µm and including a first pore portion having one or more pores, the support film having a thickness of 1 to 100 µm and including a second pore portion having one or more pores. The pores of the thin film has an average aspect ratio of not more than 2, the thin film has an opening ratio of not more than 80%, and the first pore portion in the thin film is disposed so as to meet a predetermined relationship with the second pore portion in the support film.
