| abstract |
A biaxially stretched polypropylene film includes protrusions on both surfaces, in which the biaxially stretched polypropylene film has a thickness t1 of 1 μm to 3 μm, has a tensile strength in the machine direction of 120 MPa to 250 MPa, has a tensile strength in the transverse direction of 250 MPa to 400 MPa, has a minimum protrusion height P min of 100 nm or greater and a maximum protrusion height P max of 1,600 nm or smaller for either surface, and satisfies all of Formulae (1) to (3) when one of the surfaces is surface A and the other is surface B: 0.5 Pa 250-450 /Pa≦1.0 (1), 0.5≦Pb 450-1600 /Pb≦1.0 (2), and 600≦Pa+Pb≦1,200 (3). |