PURPOSE: To make halide glass permeable to infrared light rays having wavelength up to the maximum 15μm, by using halide glass comprising one or more compounds of one or more halogenous elements of Cl, Br, and I, and K, Rb, Sr, Cd, Ba, and Pb in a desired ratio.

CONSTITUTION: Halide glass for infrared light transmission comprising 0W24 mol% KX [X is one or more halogenous elements of Cl, Br, and I], 0W24mol% RbX, 2W30mol% SrX2; 34W53mol% CdX2, 8W40mol% BaX2, and 0W23mol% RbX2. SrX2+BaX2 is 11W42mol%, KX+RbX is 8W26mol%, KX+RbX+SrX2+ CdX2+BaX2+PbX2 is 90W100mol%, and (Cl)/(X) [(Cl) is number of Cl element in glass, and (X) is number of halogen elements in glass ] is controlled to 0.86W 1.