A cold water generating apparatus according to the present disclosure includes a tank having an inlet port and an outlet port, a cooling module coupled to the tank to cool purified water introduced into the tank through the inlet port, and an internal passage unit formed inside the tank to guide the purified water from the inlet port to the outlet port, wherein a part of the purified water is phase-changed into ice within the tank by the cooling module, and another part of the purified water flows along the internal passage unit to be brought into contact with the ice so as to be discharged through the outlet port.