To provide a drink supply device capable of securing energy saving and drink quality, miniaturization of product dimension and manufacturing cost reduction by keeping a temperature in a refrigeration box constant.

A drink supply device 1 includes: a refrigeration box 22 which cools and accommodates a BIB; a tube pump 4 which pours a predetermined amount of concentrated drink from the BIB; and a cooling water tank 6 which cools stored cooling water 7 by ice bank 14a formed in the cooling water 7. It prepares drink by supplying the concentrated drink poured from the BIB and cold water cooled at a cooling coil 15. It includes: a heat exchanger 25 which is disposed in the refrigeration box 22 and cooled by the cooling water 7 stored in a cooling water tank 6; an in-box fan 26 which circulates air inside the refrigeration box 22 and performs heat exchange with the cooling water 7 at the heat exchanger 25; and a control unit which controls inside of the refrigeration box 22 so as to keep a predetermined temperature.