a coolant expansion device and the like in the same way as in a general refrigerator a water taking space 13 is disposed on the freezing chamber door 11 to allow the user to take water at the outside of the refrigerator the water taking space 13 is formed to be recessed to a certain depth from the front surface of the freezing chamber door 11 toward the rear of the refrigerator although the water taking space 13 is disposed on the freezing chamber door 11 in the example shown in fig3 the water taking space 13 may be disposed on the cooling chamber door 12 a water taking port 25 is disposed at an upper portion of the water taking space 13 to discharge water a water supply system 20 is disposed at the main body 10 and the freezing chamber door 11 to supply water to the water taking port 25 the water supply system 20 includes first second and third water supply lines 31 32 and 33 to guide water supplied from an external water supply source 36 to the water taking port 25 a water purification filter 22 to purify water a water tank 40 to store water in a cooled state and a water supply valve 24 which opens and closes the water taking port 25 to supply water the first water supply line 31 is connected to the external water supply source 36 a tap or the like through a connecting pipe 34 the water purification filter 22 is detachably mounted on a filter socket 22 a disposed at an inner.