A tinted polyester resin composition having good color and useful for many uses (fibers, films and other formed articles) contains an aromatic polyester polymer and a tinting agent; the tinting agent is contained in a content of 0.1 to 10 ppm by mass in the composition, and has a maximum absorption wavelength in the range of from 540 to 600 nm in the absorption spectrum in the wavelength band of from 380 to 780 nm, determined in a solution of the tinting agent in a concentration of 20 mg/liter in chloroform in an optical path having a length of 1 cm; and ratios of optical absorbances A400, A500, A600 and A700 of visible light spectra at wavelengths of 400 nm, 500 nm, 600 nm and 700 nm respectively to an optical absorbance Amax in the visible light spectrum at the maximum absorption wavelength, determined in the above-mentioned chloroform solution at a optical path having a length of 1 cm, satisfy the requirements of 0.00≦A400/Amax≦0.20, 0.10≦A500/Amax≦0.70, 0.55≦A600/Amax≦1.00 and 0.00≦A700/Amax≦0.05.