NOVELTY - Electrolysis method is performed by supplying electrolyte aqueous solution (W1) containing electrolyte selected from potassium carbonate, sodium carbonate, potassium hydrogen carbonate, or sodium hydrogen carbonate in 1st electrolysis chamber (2) comprising anode (5) of electrolytic cell (1), supplying water (W) to 2nd electrolysis chamber (3) comprising cathode (6) of electrolytic cell, and applying electrolytic voltage between anode and cathode and electrolyzing electrolyte aqueous solution and water by anode and cathode, respectively.    USE - Electrolysis method for production of alkaline electrolyzed water used for electrolytic cleaning agent (all claimed).    ADVANTAGE - Alkaline electrolyzed water of desired pH value can be reliably produced, electrolysis efficiency and production efficiency of alkaline electrolyzed water can be improved, electrolyte aqueous solution can be replenished, and electrolytic cleaning agent can be easily produced.    DETAILED DESCRIPTION - Electrolysis method is performed by supplying electrolyte aqueous solution (W1) containing electrolyte selected from potassium carbonate, sodium carbonate, potassium hydrogen carbonate, or sodium hydrogen carbonate in 1st electrolysis chamber (2) comprising anode (5) of electrolytic cell (1), supplying water (W) to 2nd electrolysis chamber (3) comprising cathode (6) of electrolytic cell, applying electrolytic voltage between anode and cathode and electrolyzing electrolyte aqueous solution and water by anode and cathode, respectively, allowing cation produced in 1st electrolysis chamber to pass through 2nd electrolysis chamber via ceramic diaphragm (4), generating alkaline electrolyzed water (W2) with pH value of greater than or equal to 13 by combining it with hydroxyl group of 2nd electrolysis chamber, and discharging hydrogen produced in 2nd electrolysis chamber, while discharging carbonate ion generated in 1st electrolysis chamber as carbon dioxide. Electrolysis chambers are partitioned by ceramic diaphragm where only cation passes. INDEPENDENT CLAIMS are included for:    (1) electrolyzer comprising electrolytic cell (1) containing anode (5) and cathode (6) in 2 electrolysis chambers partitioned by ceramic diaphragm (4), electrolyte aqueous solution supply unit (7) to supply electrolyte aqueous solution (W1) in 1st electrolysis chamber (2), water supply unit (8) to supply water (W) to 2nd electrolysis chamber (3), electrolytic voltage application unit (9) which applies electrolytic voltage between anode and cathode so that electrolyte aqueous solution and water may be electrolyzed by anode and cathode, respectively, electrolytic condition adjustment unit (10) to adjust electrolytic condition with respect to electrolytic voltage and electrolytic current which flows between anode and cathode so that carbonate ion generated in 1st electrolysis chamber may be exhausted as carbon dioxide, and discharge unit (11) which discharges hydrogen and carbon dioxide; and    (2) electrolytic cleaning agent containing alkaline electrolyzed water (W2) which is produced by electrolyzer and has pH value of greater than or equal to 13.    DESCRIPTION OF DRAWING(S) - The drawings show an explanatory diagram of the electrolyzer and an explanatory diagram of the electrolysis principle of the electrolyzer. (Drawing includes non-English language text).    Electrolytic cell (1)    1st electrolysis chamber (2)    2nd electrolysis chamber (3)    Ceramic diaphragm (4)    Anode (5)    Cathode (6)    Electrolyte aqueous solution supply unit (7)    Water supply unit (8)    Electrolytic voltage application unit (9)    Electrolytic condition adjustment unit (10)    Discharge unit (11)    Water (W)    Electrolyte aqueous solution (W1)    Alkaline electrolyzed water (W2)