There is provided a liquid crystal projector capable of enhancing heat radiation of light modulating means including a liquid crystal light valve, preventing dust or the like from being attached to the surface of the liquid crystal light valve, and making black matrixes formed between pixels in the liquid crystal light valve invisible. The liquid crystal projector includes a light source unit, colored-ray dividing means for dividing light emitted from the light source unit into three colored rays, light modulating means for serving to modulate the three colored rays on the basis of a given image signal and to emit the modulated rays which are predetermined linear polarized rays, colored-ray synthesizing means for synthesizing the modulated rays, and optical projection means for enlarging and projecting the synthesized rays synthesized by the colored-ray synthesizing means onto a screen. The light modulating means includes entrance dust-proof glasses 420R, 420G, and 420B made of crystallized quartz or sapphire having a uniaxial crystal structure and disposed on entrance sides of liquid crystal light valves 440R, 440G, and 440B of the light modulating means, respectively, and exit dust-proof glasses 460R, 460G, and 460B made of crystallized quartz or sapphire having birefringence and disposed on exit sides thereof, respectively.