A refrigerator comprising: a refrigerator compartment; a storage room defined next to the refrigerator compartment; a pivotable refrigerator compartment door configured to open and close the refrigerator compartment; a slidable door (140,150) configured to open and close the storage room slidably moving in a front and backward direction; a dispenser disposed on the slidable door (140, 150) to dispense water and/or ice; and an ice making compartment, fixed to a back surface of the slidable door, characterised in that the refrigerator further comprises: a freezer compartment disposed below the refrigerator compartment; a freezer compartment door slidably moving in a front and backward direction to open and close the freezer compartment; water supply passages extending from a water supply source or a water tank disposed inside the storage room towards one or all of the dispenser and the ice making compartment, the water supply passages being divided at predetermined positions, and opening/closing valves respectively disposed at the predetermined positions of the water supply passages, wherein the water supply passages are selectively decoupled or coupled at the predetermined positions where the opening/closing valves are disposed when the slidable door (140,150) slidably moves back and forth. a refrigerator compartment; a storage room defined next to the refrigerator compartment; a pivotable refrigerator compartment door configured to open and close the refrigerator compartment; a slidable door (140,150) configured to open and close the storage room slidably moving in a front and backward direction; a dispenser disposed on the slidable door (140, 150) to dispense water and/or ice; and an ice making compartment, fixed to a back surface of the slidable door, characterised in that the refrigerator further comprises: a freezer compartment disposed below the refrigerator compartment; a freezer compartment door slidably moving in a front and backward direction to open and close the freezer compartment; water supply passages extending from a water supply source or a water tank disposed inside the storage room towards one or all of the dispenser and the ice making compartment, the water supply passages being divided at predetermined positions, and opening/closing valves respectively disposed at the predetermined positions of the water supply passages, wherein the water supply passages are selectively decoupled or coupled at the predetermined positions where the opening/closing valves are disposed when the slidable door (140,150) slidably moves back and forth. a freezer compartment disposed below the refrigerator compartment; a freezer compartment door slidably moving in a front and backward direction to open and close the freezer compartment; water supply passages extending from a water supply source or a water tank disposed inside the storage room towards one or all of the dispenser and the ice making compartment, the water supply passages being divided at predetermined positions, and opening/closing valves respectively disposed at the predetermined positions of the water supply passages, wherein the water supply passages are selectively decoupled or coupled at the predetermined positions where the opening/closing valves are disposed when the slidable door (140,150) slidably moves back and forth.