PROBLEM TO BE SOLVED: To provide an ultraviolet irradiation device capable of easily visually recognizing whether or not ultraviolet irradiation is performed without inviting an increase in size of the device. An ultraviolet irradiation device includes a power supply unit, a first discharge lamp that includes a first tube and emits ultraviolet light, a second discharge lamp that includes a second tube and emits visible light, and a side surface of the first tube. The first electrode region, which is in contact with a part of the upper region or is formed inside the first tube and is electrically connected to the power supply unit, is separated from the first electrode region on the side surface of the first tube. A second electrode region formed in contact with the region and electrically connected to the power supply unit, and formed in contact with a partial region on the side surface of the second pipe or inside the second pipe, A fourth electrode that is formed in contact with a region separated from the third electrode region that is electrically connected to the power supply unit and the third electrode region on the side surface of the second tubular body and that is electrically connected to the power supply unit. It has a region and a light irradiation window for taking out both the ultraviolet ray and the visible light from the same place, or for individually taking out the ultraviolet ray and the visible light respectively. [Selection diagram]【課題】装置の大型化を招くことなく、紫外線が照射されているか否かを容易に視認することのできる、紫外線照射装置を提供する。【解決手段】紫外線照射装置は、電源部と、第一管体を含み紫外線を発する第一放電ランプと、第二管体を含み可視光を発する第二放電ランプと、第一管体の側面上の一部領域に接触して又は第一管体の内部に形成され電源部と電気的に接続される第一電極領域と、第一管体の側面上の第一電極領域とは離間した領域に接触して形成され、電源部と電気的に接続される第二電極領域と、第二管体の側面上の一部領域に接触して又は第二管体の内部に形成され、電源部と電気的に接続される第三電極領域と、第二管体の側面上の第三電極領域とは離間した領域に接触して形成され、電源部と電気的に接続される第四電極領域と、紫外線及び可視光の両者を同一箇所から取り出すための、又は紫外線及び可視光のそれぞれを個別に取り出すための光照射窓を有する。【選択図】 図１８
