Cold-water generating tank, and water cooler equippped with same

A cold water generating tank comprising

• a tank body accommodating an ice storage liquid cooled by a cooling unit;
• a cooling tube included in the tank body and configured to cool the ice storage liquid accommodated in the tank body;
• and
• a cold water generating unit including a heat exchange tube configured to form a flow path on which inflowing water becomes cold water by heat exchange with the ice storage liquid and an extension member located in an outer circumferential surface of the heat exchange tube and configured to increase a contact area with the ice storage liquid,
• wherein the cooling tube and the cold water generating unit are layered and stacked in a vertical direction inside the tank body, and
• the extension member has a shape protruding from the outer circumferential surface of the heat exchange tube, and consist of an ice contact member configured to be in contact with ice formed on a circumference of the cooling tube.