NOVELTY - A hydrogen-dissolved water manufacturing apparatus comprises electrolysis cell which has cation exchange membrane (15) between anode chamber (12) equipped with anode (11) and cathode chamber (14), which is equipped with cathode (13) and is where pure water or ultrapure water flows, voltage application part to apply direct current (DC) voltage between anode and cathode, and hydrogen dissolution part to produce hydrogen-dissolved water so that bubble of hydrogen gas may not remain. A hydrogen ion is generated in anode chamber interior by DC voltage and guided to cathode chamber.    USE - A hydrogen-dissolved water manufacturing apparatus for pure-water manufacturing system (claimed).    ADVANTAGE - The apparatus is safe because there is no possibility that hydrogen and oxygen may mix and explode.    DETAILED DESCRIPTION - A hydrogen-dissolved water manufacturing apparatus comprises electrolysis cell which has cation exchange membrane between anode chamber equipped with anode and cathode chamber, which is equipped with cathode and is where pure water or ultrapure water flows, voltage application part to apply DC voltage between anode and cathode, and hydrogen dissolution part to produce hydrogen-dissolved water so that bubble of hydrogen gas may not remain. A hydrogen ion is generated in anode chamber interior by DC voltage and guided to cathode chamber through cation exchange membrane to recombine with electron and produce hydrogen molecule. Hydrogen molecule is dissolved in pure water or ultrapure water water-flowed by cathode chamber interior to obtain hydrogen-dissolved water. An INDEPENDENT CLAIM is included for pure-water manufacturing system comprising UV irradiation part to irradiate UV-ray with respect to to-be-processed water, hydrogen-dissolved water manufacturing apparatus by which water processed by UV irradiation part is supplied to the cathode chamber, and dissolved oxygen removal part to make water which flows out of cathode chamber contact with platinum group metal supported catalyst and remove the oxidizing substance in the water.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the hydrogen-dissolved water manufacturing apparatus. (Drawing includes non-English language text).    Anode (11)    Anode chamber (12)    Cathode (13)    Cathode chamber (14)    Cation exchange membrane (15)