To provide a dissolved oxygen water-producing apparatus for producing neutral fresh water having enriched dissolved oxygen.

The dissolved oxygen water-producing apparatus is provided with: a water storage vessel 10 for storing raw material water; an electrode member 30 arranged on the bottom 10b of the water storage vessel 10 and provided with a pair of electrodes comprising a cathode electrode 31 and an anode electrode 32 in a center member 33; and a controller 40 for carrying out various control related to the supply of DC voltage to the electrode member 30. The controller 40 is provided with: a voltage converting means 42 for converting AC voltage supplied from an outside power source 50 to DC voltage; a timing means 43 for timing a preset switching time for switching the polarity of the DC voltage supplied to each electrode 31, 32 of the electrode member 30 and outputting switching information corresponding to the timing when the switching time is timed: and a polarity switching means 44 for switching the voltage supplied to each electrode 31, 32 of the electrode member 30 based on the switching information output from the timing means 43 to reverse the polarity of each electrode 31, 32.

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