An exhaust gas recirculation cooler which receives exhaust gas and recirculates cooled exhaust gas, the EGR cooler comprising: a housing, which has a cuboid shape, comprising: an exhaust gas inlet and an exhaust gas outlet through which exhaust gas is introduced and discharged, respectively; a coolant inlet and a coolant outlet through which a coolant for cooling the exhaust gas is introduced and discharged, respectively; and a plurality of grooves protruding inward from upper and lower surfaces of the housing; a plurality of tubes spaced apart from each other in the housing so that exhaust gas, which flows from the exhaust gas inlet to the exhaust gas outlet, flows in the housing between the plurality of tubes; and a plurality of supporters supporting the plurality of tubes in the housing, wherein the plurality of supporters are disposed between an upper surface of the housing and a tube adjacent the upper surface of the housing among the plurality of tubes, between an lower surface of the housing and a tube adjacent the lower surface of the housing among the plurality of tubes, and between the plurality of tubes so that the plurality of supporters are disposed in a space in which the coolant flows inside the housing, wherein the supporter, which is disposed between the upper surface of the housing and the tube adjacent the upper surface of the housing, and the supporter, which is disposed between the lower surface of the housing and the tube adjacent the lower surface of the housing, are supported by the plurality of grooves and brazed together to be combined with the housing and the tube adjacent the upper surface of the housing and the tube adjacent the lower surface of the housing, respectively, and characterized in that each of the plurality of supporters comprises: flat planar portions; a plurality of through holes between the planar portions; and a plurality of convex portions disposed between the plurality of through holes and protruding upwardly. a housing, which has a cuboid shape, comprising: an exhaust gas inlet and an exhaust gas outlet through which exhaust gas is introduced and discharged, respectively; a coolant inlet and a coolant outlet through which a coolant for cooling the exhaust gas is introduced and discharged, respectively; and a plurality of grooves protruding inward from upper and lower surfaces of the housing; an exhaust gas inlet and an exhaust gas outlet through which exhaust gas is introduced and discharged, respectively; a coolant inlet and a coolant outlet through which a coolant for cooling the exhaust gas is introduced and discharged, respectively; and a plurality of grooves protruding inward from upper and lower surfaces of the housing; a plurality of tubes spaced apart from each other in the housing so that exhaust gas, which flows from the exhaust gas inlet to the exhaust gas outlet, flows in the housing between the plurality of tubes; and a plurality of supporters supporting the plurality of tubes in the housing, wherein the plurality of supporters are disposed between an upper surface of the housing and a tube adjacent the upper surface of the housing among the plurality of tubes, between an lower surface of the housing and a tube adjacent the lower surface of the housing among the plurality of tubes, and between the plurality of tubes so that the plurality of supporters are disposed in a space in which the coolant flows inside the housing, wherein the supporter, which is disposed between the upper surface of the housing and the tube adjacent the upper surface of the housing, and the supporter, which is disposed between the lower surface of the housing and the tube adjacent the lower surface of the housing, are supported by the plurality of grooves and brazed together to be combined with the housing and the tube adjacent the upper surface of the housing and the tube adjacent the lower surface of the housing, respectively, and characterized in that each of the plurality of supporters comprises: flat planar portions; a plurality of through holes between the planar portions; and a plurality of convex portions disposed between the plurality of through holes and protruding upwardly. flat planar portions; a plurality of through holes between the planar portions; and a plurality of convex portions disposed between the plurality of through holes and protruding upwardly.