An apparatus for purifying water comprises: an ice making unit configured to make introduced water into ice cubes, and to store the ice cubes; a cold water unit configured to generate cold water by receiving the ice cubes made by the ice making unit; and a cooling unit configured to supply cold air to the ice making unit. Firstly, since cold water is generated by using ice cubes made by the ice making unit, may be solved the conventional problem that the ice cubes cling to each other due to contact with the cold water. Secondly, the ice making unit, the cold water unit, etc. may be installed so as to be stacked with each other in upper and lower directions, the apparatus for purifying water may have a slim configuration.