PROBLEM TO BE SOLVED: To provide a technology to sterilize the inside of a coupler connected to a blood purifier.SOLUTION: A blood purification device 10 includes a control device 50 for controlling supply of dialysis fluid to a blood purifier 20, a dialysis fluid supply tube 66 through which the dialysis fluid flows from the control device 50 to the blood purifier 20, a dialysis fluid discharge tube 68 through which the dialysis fluid flows from the blood purifier 20 to the control device 50, a supply side coupler 30a for connecting the dialysis supply tube 66 and a dialysis fluid inflow pipe 26 of the blood purifier 20, and a discharge side coupler 30b for connecting the dialysis fluid discharge tube 68 and a dialysis fluid outflow pipe 28 of the blood purifier 20. At least one of the supply side coupler 30a and the discharge side coupler 30b includes a light source part configured so as to irradiate an ultraviolet light to the inside of the coupler.SELECTED DRAWING: Figure 1【課題】血液浄化器に接続されるカプラの内部を殺菌する技術を提供する。【解決手段】血液浄化装置１０は、血液浄化器２０への透析液の供給を制御する制御装置５０と、制御装置５０から血液浄化器２０に向けて透析液が流れる透析液供給チューブ６６と、血液浄化器２０から制御装置５０に向けて透析液が流れる透析液排出チューブ６８と、透析液供給チューブ６６と血液浄化器２０の透析液流入管２６との間を接続する供給側カプラ３０ａと、透析液排出チューブ６８と血液浄化器２０の透析液流出管２８との間を接続する排出側カプラ３０ｂと、を備える。供給側カプラ３０ａおよび排出側カプラ３０ｂの少なくとも一方は、カプラの内部に紫外光を照射するよう構成される光源部を有する。【選択図】図１
