| abstract |
(57) [Problem] To provide a biaxially stretched polyester film for insert molding excellent in moldability. Further, the present invention provides a biaxially stretched polyester film for insert molding, which is excellent in moldability and solvent resistance, and is particularly suitable for use in application of coloring and / or design to a resin molded product. SOLUTION: When a refractive index in a longitudinal direction, a width direction and a thickness direction of a film is Nx, Ny, and Nz, respectively, an in-plane orientation degree ΔP obtained by an equation: ΔP = (Nx + Ny) / 2−Nz Is from 0.09 to 0.15. In addition, the degree of in-plane orientation ΔP And the average refractive index of the film N ((Nx + N (y + Nz) / 3) is 1.59 or more. |