PROBLEM TO BE SOLVED: To realize a blood purification device comprising a compact ultraviolet irradiation device capable of changing an ultraviolet irradiation amount and a control device for controlling the ultraviolet irradiation device.SOLUTION: A blood purification device 1 comprises: a blood purifier 10； a blood circuit 11 for supplying blood from a patient to the blood purifier 10 and returning the blood from the blood purifier 10 to the patient； a dialysate solution circuit 12 for generating a dialysate solution by mixing a stock solution with water, and supplying the dialysate solution to the blood purifier 10； an ultraviolet irradiation device 13 for irradiating at least one of water before mixing and the dialysate solution in the dialysate solution circuit 12 with an ultraviolet ray by an ultraviolet LED； and a control device 14 for controlling an irradiation output of the ultraviolet irradiation device 13.SELECTED DRAWING: Figure 1【課題】小型で紫外線照射量も変更可能な紫外線照射装置とその紫外線照射装置を制御する制御装置を備えた血液浄化装置を実現する。【解決手段】血液浄化装置１は、血液浄化器１０と、患者から血液浄化器１０に血液を供給し血液浄化器１０から患者に戻す血液回路１１と、水に原液を混合して透析液を生成し、その透析液を血液浄化器１０に供給する透析液回路１２と、透析液回路１２における混合前の水又は透析液の少なくともいずれかに紫外線ＬＥＤにより紫外線を照射する紫外線照射装置１３と、紫外線照射装置１３の照射出力を制御する制御装置１４と、を有する。【選択図】図１
