A water purifier includes: a cooling water tank that keeps cooling water; a stirring member that is provided in the cooling water tank to stir cooling water; a cold water pipe that is provided in the cooling water tank; an evaporator that is provided in the cooling water tank; and a separator on which the evaporator is provided and that is provided over the cold water pipe to divide the internal space of the cooling water tank into a first space and a second space, in which the separator has: a bottom that is horizontally formed and has a center hole through which the stirring member is inserted; a first extension that extends upward from the edge of the center hole; and a plurality of separation walls that extend upward from the top of the bottom and are arranged at a predetermined distance from each other around the center hole.