Electrolyzed water containing chlorine gas and hydrogen gas is provided, wherein the electrolyzed water has improved storage stability and provides satisfactory cleaning efficiency. In a fine bubble electrolyzed water generating apparatus and a method for generating fine bubble electrolyzed water, an electrolytic apparatus having a three-chamber structure is provided including an anode chamber 1 with an anode electrode, a cathode chamber 2 with a cathode electrode, an intermediate chamber 3, and diaphragms 4 and 5 provided between the intermediate chamber and each of the anode chamber and the cathode chamber. An acidic electrolyzed water storage tank 10 and an alkaline electrolyzed water storage tank 11 are provided adjacent to the apparatus. The respective storage tanks are in communication with the anode chamber and the cathode chamber through pipes. The respective storage tanks are in communication with nanobubble generators 14. The generators generate chlorine gas and nanobubble electrolyzed water with chlorine gas and acidic electrolyzed water produced in the anode chamber and generate hydrogen nanobubble electrolyzed water with hydrogen gas and alkaline electrolyzed water produced in the cathode chamber.本發明提供之電解水，其係可提高含氯氣及氫氣之電解水的保存安定性，而得到令人滿意之洗淨效率者。該微細氣泡電解水生成裝置及微細氣泡電解水的生成方法，係設置：具有陽極電極之陽極室(1)、具有陰極電極之陰極室(2)、中間室(3)、及設置在該陽極室及該陰極室之各中間室之間的隔膜(4)、(5)之(3)室構造的電解裝置；隣接該裝置，再設置酸性電解水儲存槽(10)、及鹼性電解水儲存槽(11)；該各儲存槽，再以配管連接陽極室及陰極室；各儲存槽，又連接奈米氣泡生成裝置(14)，而以該裝置生成：陽極室所發生之氯氣、酸性電解水的氯氣奈米氣泡電解水；陰極室所發生之氫氣、鹼性電解水的氫奈米氣泡電解水。
