An electrolysis water-making apparatus for making electrolysis water by electrolyzing a raw material solution including a chlorine ion, the electrolysis water-making apparatus comprising: an electrolytic cell; a raw material solution feed pump used to supply the raw material solution to the electrolytic cell; a raw material solution pipe connecting an outlet of the raw material solution feed pump allowing the raw material solution to be discharged therefrom and an inlet of the electrolytic cell allowing the raw material solution to flow thereinto; and an electrolyzed solution advection-deterring portion formed in the raw material solution pipe between the outlet and the inlet, wherein the raw material solution feed pump is provided so that the outlet is disposed on an upper side of the inlet, wherein a downward slope pipeline in which an end thereof near the inlet is disposed on an upper side of another end thereof near the outlet is provided in at least a part of the electrolyzed solution advection-deterring portion, and wherein (i) the electrolyzed solution advection-deterring portion is formed into an annular shape wound around a central axis extending in a horizontal direction; or (ii) the electrolyzed solution advection-deterring portion is formed to include at least one of a U-shaped part and an inverted U-shaped part curved around a central axis extending in a horizontal direction; or (iii) the electrolyzed solution advection-deterring portion is formed into an annular shape wound around a central axis extending in a vertical direction; or (iv) the electrolyzed solution advection-deterring portion is formed to include a tiered part sloping upward as it approaches from the outlet toward the inlet. an electrolytic cell; a raw material solution feed pump used to supply the raw material solution to the electrolytic cell; a raw material solution pipe connecting an outlet of the raw material solution feed pump allowing the raw material solution to be discharged therefrom and an inlet of the electrolytic cell allowing the raw material solution to flow thereinto; and an electrolyzed solution advection-deterring portion formed in the raw material solution pipe between the outlet and the inlet, wherein the raw material solution feed pump is provided so that the outlet is disposed on an upper side of the inlet, wherein a downward slope pipeline in which an end thereof near the inlet is disposed on an upper side of another end thereof near the outlet is provided in at least a part of the electrolyzed solution advection-deterring portion, and wherein (i) the electrolyzed solution advection-deterring portion is formed into an annular shape wound around a central axis extending in a horizontal direction; or (ii) the electrolyzed solution advection-deterring portion is formed to include at least one of a U-shaped part and an inverted U-shaped part curved around a central axis extending in a horizontal direction; or (iii) the electrolyzed solution advection-deterring portion is formed into an annular shape wound around a central axis extending in a vertical direction; or (iv) the electrolyzed solution advection-deterring portion is formed to include a tiered part sloping upward as it approaches from the outlet toward the inlet. (i) the electrolyzed solution advection-deterring portion is formed into an annular shape wound around a central axis extending in a horizontal direction; or (ii) the electrolyzed solution advection-deterring portion is formed to include at least one of a U-shaped part and an inverted U-shaped part curved around a central axis extending in a horizontal direction; or (iii) the electrolyzed solution advection-deterring portion is formed into an annular shape wound around a central axis extending in a vertical direction; or (iv) the electrolyzed solution advection-deterring portion is formed to include a tiered part sloping upward as it approaches from the outlet toward the inlet.