To provide a polyester film having excellent laser processability and provide a release film for wiring substrate manufacturing having excellent economical efficiency and peelability.SOLUTION: A polyester film for a laser processing support contains no ultraviolet absorber. In the polyester film, the ratio between a number average molecular weight (Mn) and a weight average molecular weight (Mw) (Mw/Mn) is 2.50 or more, and a spectral transmittance at wavelength 355 nm is higher than 75 percent.SELECTED DRAWING: None

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