The electrolysis water-making apparatus (A) includes: an electrolytic cell (2); a raw material solution feed pump (3) used to supply the raw material solution (W1, W3) to the electrolytic cell (2); a raw material solution pipe (32, 36) connecting an outlet (3b) of the raw material solution feed pump (3) and an inlet (26) of the electrolytic cell (2); and an electrolyzed solution advection-deterring portion (40) formed in the raw material solution pipe (32, 36) between the outlet (3b) and the inlet (26). The raw material solution feed pump (3) is provided so that the outlet (3b) is disposed on an upper side of the inlet (26). A pitched pipe (32c) in which an end thereof near the inlet (26) is disposed on an upper side of another end thereof near the outlet (3b) is provided in at least a part of the electrolyzed solution advection-deterring portion (40).