Biaxially oriented polyester film roll

A polyester film roll obtained by winding a biaxially oriented polyester film around a core, wherein

• the biaxially oriented polyester film consists of polyethylene terephthalate and particles formed of silica,
• the content of the silica in the biaxially oriented polyester film is 100 ppm by weight or more and 20,000 ppm by weight or less,
• the weight average particle size of the silica measured by a Coulter counter is 0.05 μm to 3.0 μm,
• the biaxially oriented polyester film has a thickness of 5 μm or more and 40 μm or less,
• an average winding hardness on a surface of the polyester film roll is in a range of 500 or more and 700 or less,
• a variation rate of a winding hardness on a surface of the polyester film roll in a film transverse direction is 1% or more and 5% or less,
• a variation rate of an average winding hardness from a surface of the polyester film roll to the core is 3% or more and 10% or less,
• static friction coefficient on each of a winding outer surface and a winding inner surface of the biaxially oriented polyester film is 0.2 or more and 0.60 or less, and
• arithmetic mean height on a winding inner surface of the biaxially oriented polyester film is 0.010 μm or more and 0.050 μm or less.