A funnel glass for a cathode ray tube capable of preventing the contrast of the cathode ray tube from lowering by absorbing light invaded in the funnel glass thereby, wherein a light transmittance in the range of wavelength of 450 to 650 nm is 80% or less when the wall thickness of the glass is 10 mm, and an X-ray absorption coefficient when the wavelength is 0.06 nm is 40 cm-1 or larger.