An electrolyzed water generation device comprising: an electrolytic chamber to which water to be electrolyzed is supplied; a first power feeder and a second power feeder disposed facing each other in the electrolytic chamber; and a membrane arranged between the first power feeder and the second power feeder and dividing the electrolytic chamber into a first polar chamber on a side of the first power feeder and a second polar chamber on a side of the second power feeder, characterized in that the electrolyzed water generation device further comprises: a first flow passage delivering electrolyzed water generated in one of the first polar chamber and the second polar chamber to a first water discharge port; a second flow passage delivering electrolyzed water generated in another one of the first polar chamber and the second polar chamber to a second water discharge port; a flow passage switching valve switching connections of the first polar chamber and the second polar chamber to the first flow passage and the second flow passage; a polarity switching unit switching polarities of the first power feeder and the second power feeder; a determination unit determining switching timing of the polarity switching unit and the flow passage switching valve; and a water supply detection unit detecting water supply to the electrolytic chamber, and wherein the determination unit determines that the switching timing arrives when a predetermined time passes without the water supply detection unit detecting water supply to the electrolytic chamber after electrolysis is performed by a predetermined number of times or more in the electrolytic chamber without the polarities being switched. an electrolytic chamber to which water to be electrolyzed is supplied; a first power feeder and a second power feeder disposed facing each other in the electrolytic chamber; and a membrane arranged between the first power feeder and the second power feeder and dividing the electrolytic chamber into a first polar chamber on a side of the first power feeder and a second polar chamber on a side of the second power feeder, characterized in that the electrolyzed water generation device further comprises: a first flow passage delivering electrolyzed water generated in one of the first polar chamber and the second polar chamber to a first water discharge port; a second flow passage delivering electrolyzed water generated in another one of the first polar chamber and the second polar chamber to a second water discharge port; a flow passage switching valve switching connections of the first polar chamber and the second polar chamber to the first flow passage and the second flow passage; a polarity switching unit switching polarities of the first power feeder and the second power feeder; a determination unit determining switching timing of the polarity switching unit and the flow passage switching valve; and a water supply detection unit detecting water supply to the electrolytic chamber, and wherein the determination unit determines that the switching timing arrives when a predetermined time passes without the water supply detection unit detecting water supply to the electrolytic chamber after electrolysis is performed by a predetermined number of times or more in the electrolytic chamber without the polarities being switched. a first flow passage delivering electrolyzed water generated in one of the first polar chamber and the second polar chamber to a first water discharge port; a second flow passage delivering electrolyzed water generated in another one of the first polar chamber and the second polar chamber to a second water discharge port; a flow passage switching valve switching connections of the first polar chamber and the second polar chamber to the first flow passage and the second flow passage; a polarity switching unit switching polarities of the first power feeder and the second power feeder; a determination unit determining switching timing of the polarity switching unit and the flow passage switching valve; and a water supply detection unit detecting water supply to the electrolytic chamber, and wherein the determination unit determines that the switching timing arrives when a predetermined time passes without the water supply detection unit detecting water supply to the electrolytic chamber after electrolysis is performed by a predetermined number of times or more in the electrolytic chamber without the polarities being switched.