PROBLEM TO BE SOLVED: To provide a dissolution apparatus that can prevent supply shortage of a stock solution for dialysis from occurring during operation of the apparatus.SOLUTION: A dissolution apparatus has a dissolution tank 2, a preparation unit 31 for preparing a stock solution for dialysis in the dissolution tank, a reservoir tank 3 for receiving the stock solution for the dialysis being fed from the dissolution tank, a solution feed unit 32 for feeding the stock solution for the dialysis to the reservoir tank from the dissolution tank, and a control unit 50 for controlling the preparation unit and the solution feed unit. The dissolution apparatus 1 supplying the stock solution for the dialysis to a supply object from the reservoir tank has detection means F3 for inputting a detection signal into the control unit when a water level of the stock solution for the dialysis in the reservoir tank becomes a predetermined water level. The control unit can perform control by switching between a first mode for performing control so that the water level of the stock solution for the dialysis in the reservoir tank may become equal to or higher than the predetermined water level using the detection signal as the signal showing the lower limit of the water level of the stock solution for the dialysis in the reservoir tank and a second mode for performing control so that the water level of the stock solution for the dialysis in the reservoir tank may become equal to or lower than the predetermined water level using the detection signal as the signal showing the upper limit of the water level of the stock solution for the dialysis in the reservoir tank.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】装置の稼働時に透析用原液の供給不足が生じることを防止することが可能な溶解装置を提供する。【解決手段】溶解槽２と、溶解槽で透析用原液を調製する調製部３１と、溶解槽から送られた透析用原液を収容する貯留槽３と、溶解槽から貯留槽に透析用原液を送る送液部３２と、調製部及び送液部の制御を行う制御部５０とを有し、貯留槽から供給対象に透析用原液を供給する溶解装置１は、貯留槽内の透析用原液の水位が所定の水位になった場合に検知信号を制御部に入力する検知手段Ｆ３を有し、制御部は、検知信号を貯留槽内の透析用原液の水位の下限を示す信号として用い、貯留槽内の透
