To provide a colored polyester film which prevents color transfer due to the phenomenon that an organic pigment in the polyester film bleeds out to the film surface by high temperatures or a prolonged moist heat or dry heat treatment and which is restrained in color change by repeated heating due to poor heat resistance of the pigment.The polyester film uses a polyester resin that contains 0.01-5 wt% of an organic pigment having a molecular weight of 695-1,000.
