An electrolyzed water production device that electrolyzes water containing chloride ions to produce electrolyzed water containing hypochlorous acid, wherein said device comprises an electrolysis tank through which the water passes, and an electrode provided within the electrolysis tank, the electrode comprising a catalytic layer containing iridium oxide, tantalum oxide, and rhodium oxide, and the proportion of the number of atoms of the rhodium in the catalytic layer to the sum of the number of atoms of iridium contained in the iridium oxide, the number of atoms of tantalum contained in the tantalum oxide, and the number of atoms of rhodium contained in the rhodium oxide being 31% to 60%.一種電解水產生裝置，是電解含氯離子的水以產生含次氯酸之電解水的電解水產生裝置，具備上述水通過之電解槽和設在上述電解槽內之電極，上述電極具有含二氧化銥、五氧化二鉭、三氧化二銠的觸媒層，在上述觸媒層中，相對於包含在上述二氧化銥之銥的原子數、與包含在上述五氧化二鉭之鉭的原子數、與包含在上述三氧化二銠之銠的原子數的和，上述銠之原子數的比例為31%以上60%以下。
