To provide a biaxially oriented polyester film suitable for a dry film resist support capable of reducing scattering of ultraviolet light during exposure by making the thickness of a particle-containing layer on an exposure surface smaller than the particle size of contained particles and reducing overlap of particles in a thickness direction and capable of suppressing occurrence of unevenness on a resist pattern wall surface while maintaining high handling properties. A biaxially oriented laminated polyester film that satisfies the following (1) and (2): (1) a laminated polyester film is composed of at least three layers including a polyester layer a (layer a) that satisfies Formula 1 and a C layer that does not have a film surface on at least one surface layer; (2) when the particle size of particles a with the largest particle size contained in the a layer is DA (micro), DA-TA satisfies formula 3. 0.10 <...

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