PROBLEM TO BE SOLVED: To provide a device which can produce purified water having a high dissolved hydrogen concentration.SOLUTION: In a purified water production device, a water softener (1), an adsorber (2), an electrolytic water storage tank (6), and an RO device (3) are connected in this order, a permeate outlet line (15) of the RO device (3) is connected to a permeate tank (5), a concentrate outlet line (17) is connected to an electrolytic water production device (4), and the electrolytic water production device (4) is connected to the electrolytic water storage tank (6).【課題】溶存水素濃度の高い精製水が製造できる装置の提供。【解決手段】軟水器(1)、吸着装置(2)、電解水貯水タンク(6)及びＲＯ装置(3)がこの順序で接続されており、ＲＯ装置(3)の透過水出口ライン(15)が透過水タンク(5)に接続され、濃縮水出口ライン(17)が電解水製造装置(4)に接続され、電解水製造装置(4)が電解水貯水タンク(6)に接続されている精製水の製造装置。【選択図】図１
