| abstract |
(57) [Problem] To provide a biaxially oriented polyester film with further improved light transmission properties and a light-diffusing layer, particularly a layer containing resin beads, while maintaining its productivity. Provided is a biaxially oriented polyester film useful as a base film of a light diffusion plate. SOLUTION: Inactive particles are contained in an amount of 0.00009 to 0.00. 5% by weight, intrinsic viscosity (η A ) of 0.50 to 0.58 Polyester layer ( B ) containing 0.001 to 0.01% by weight of inert particles and having an intrinsic viscosity (η B ) of 0.54 to 0.62 on one or both sides of the polyester layer (A) And a layer having a total thickness of 50 μm or more and 200 μm or less, wherein η B is larger than η A , and 10 A biaxially oriented laminated polyester film having a haze value per 0 μm of less than 0.7% and a total light transmittance of 90% or more. |