| CPC G01J 3/108 (2013.01) [G01J 3/0202 (2013.01); G01J 3/4535 (2013.01); G01N 21/35 (2013.01); G01N 2021/3595 (2013.01)] | 3 Claims |

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1. An infrared light source device comprising:
a heater which emits infrared light by being heated; and
a cover member arranged to cover an entire circumference of the heater without contacting the heater, and having a hole formed therein for emitting the infrared light from the heater to outside, wherein a material for the cover member is aluminum with a purity of 99% or more;
a material for an inner wall of the cover member being aluminum or gold.
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