A light reflector formed of a biaxially-stretched film which contains a thermoplastic
resin and a filler and has an opacity of at least 95%, a whiteness of at least
90%, a reflectance R0 of at least 92%, and an areal draw ratio of from
22 to 80 times, wherein the color difference EH, after irradiated
with a metal halide lamp spaced from the light reflector by 10 cm under an environmental
condition of 83 C. and a relative humidity of 50% and at an intensity of
radiation of 90 mW/cm2 for 10 hours, is at most 10. The reflector is
free from the trouble of yellowing as in white polyester films heretofore used
in reflectors and is stable against color change for a long period of time.
