Abstract: In the present invention, by making an alkaline ionic water conditioner in which an electrolysis current detection device has a plurality of output means different in conversion level, and conversion levels are switched in accordance with the level of a current flowing in an electrolyte, and which has an optimum pH control function by performing duty control, in case of electrifying certain raw water, or in case of adding brine for strongly accelerating generation, when a current flowing between electrode plates is high, the conversion level of the electrolysis current detection device is lowered to generate electrolyte water of pH 10 or more. When the current is low, an electrolysis current detection range with a high resolution can be obtained by raising the conversion level, proper pH control can be performed in accordance with change in electrolysis current in the quality of raw water and adding brine.