ULTRAVIOLET IRRADIATION DEVICE

To provide an ultraviolet irradiation device which can suppress a demerit of a material used in a window material.SOLUTION: An ultraviolet irradiation device includes a light source 2 for emitting ultraviolet light, a substrate 5 provided with the light source, and a window part 4 which covers the light source 2 from a side opposite to the substrate 5 and transmits the ultraviolet light emitted from the light source 2, in which the window part 4 is composed of two layers of a first window part 4a and a second window part 4b, the first window part 4a and the second window part 4b are composed of different members, the first window part 4a is provided at a position closer to the light source 2 than the second window part 4b, and the length of the first window part 4a in the thickness direction of the window part 4 is longer than the length of the second window part 4b in the thickness direction of the window part 4.SELECTED DRAWING: Figure 5 【課題】窓材に用いられる材料のもつ短所を抑制することができるような紫外線照射装置を得ることを目的とする。【解決手段】紫外線を照射する光源２と、光源が設けられている基板５と、基板５に対して反対側から光源２を覆い、光源２から照射された紫外線を透過する窓部４と、を備え、窓部４は、第一窓部４ａと第二窓部４ｂの２層から構成されており、第一窓部４ａと第二窓部４ｂは別の部材からなり、第一窓部４ａは第二窓部４ｂよりも光源２に近い位置に設けられ、窓部４の厚み方向における第一窓部４ａの長さは、窓部４の厚み方向における第二窓部４ｂの長さよりも長い、紫外線照射装置。【選択図】図５