Abstract: The present invention discloses a process for producing an electrolytic water, wherein a to-be-electrolyzed water containing less than 0.1 mM of a water-soluble inorganic salt, 0.05 to 0.5 mass % of a hydroquinone derivative and 1 to 50 mM of L-ascorbic acid or a derivative thereof is fed into a diaphragm-free electrolytic cell of continuous flow type at a flow rate of 5 to 3,000 l/min and electrolysis is conducted continuously at a current density of 0.003 to 0.1 A/cm2. The process can produce an electrolytic water having a high skin-whitening effect owing to the reducing action of L-ascorbic acid and the melanin formation-suppressing effect of hydroquinone derivative.