| abstract |
A biaxially oriented polyester film including a polyester layer (P1 layer) containing a polyester including ethylene terephthalate as a main constituent, a high melting point resin having a melting point Tm B1 of not less than 260° C. and not more than 320° C., and inorganic particles, wherein content of the high melting point resin in the P1 layer, W B1 , is not less than 2% by mass and not more than 40% by mass based on the P1 layer; in the P1 layer, dispersion phases composed of the high melting point resin are present in the polyester; and average longitudinal length of the dispersion phases is not more than 10,000 nm (10 μm). |