To efficiently prevent chemical substances from being stuck to gas bubbles in the vicinity of each of the electrodes or to the surface of each of the electrodes, and to maintain the situation, in the device by providing the device with an ultrasonic wave generator mechanically connected to electrodes.

This device is provided with: an electrolyzer 3 having an anode 4 and a cathode 6, to the both of which insulators 11 are connected respectively with an adhesive; and an ultrasonic wave generator 17, each of electrodes 12 of which is connected to one of the insulators 11 with an adhesive. In the device, acidic water and alkaline water are produced in an anode chamber 5 and a cathode chamber 7 respectively from introduced water by electrolysis of the introduced water. In the production of the acidic water and alkaline water, by applying a voltage from an AC power source 15 to between the electrode 12 and another electrode 13, ultrasonic waves are generated from an ultrasonic wave transducer 16 and the generated ultrasonic waves are directly transmitted to the anode 4 and cathode 6 through insulators 11 respectively. Thus, with the transmitted ultrasonic waves, bubbles of gas such as gaseous oxygen or gaseous hydrogen, generated by the electrolysis, are prevented from being accumulated in the vicinity of the surface of each of the electrodes, i.e., the anode 4 and cathode 6 and accordingly, chemical substances such as calcium carbonate, which are conventionally liable to be stuck particularly to gas bubbles in the vicinity of the cathode 6, are hardly stuck to the electrodes 4 and 6.