It is disclosed a heat exchanger comprising a hollow housing. Groups exchanger according to an embodiment of the present invention, a heat exchanger 500 for cooling the fluid of high temperature; The tube bundle section (100, tube bundle part) including a heat exchange tube 101 is that the fluid can flow; The tube bundle unit wrapped around a 100 housing part for accommodating and fixing therein (200); It formed on one side of the housing part 200, a refrigerant inlet 310 for inducing a refrigerant into the housing; It is formed on the other side of the housing part 200, a refrigerant outlet 320 for inducing a refrigerant into the outer housing; It is protrudingly formed at one end of the housing 200, the fluid flows in the first guide member 410, which can be induced to flow into the tube bundle section (100); And there is protrudingly formed at the other end of the housing portion 200, wherein the fluid is discharged the second guide member 420 to drive so that it can be discharged to the outside from the tube bundle section (100) including, but the housing portion 200, the first guide member 410 and the second guide member 420 is a hollow structure.