This invention is intended to provide a biaxially oriented polypropylene film capable of exhibiting excellent high breakdown voltage and preservability even in a high temperature atmosphere of 80°C or higher. The biaxially oriented polypropylene film of this invention is a polypropylene film formed of a polypropylene resin mainly composed of propylene, at least one of the surfaces of which has a basic surface configuration consisting of crepe-like asperity and having a 10-point mean roughness (Rz) of 0.5 to 1.5 µm and a surface glossiness of 90 to 135%.
