Disclosed is an EGR cooler. The EGR cooler includes: a laminated tube core formed by laminating a plurality of gas channels side by side, wherein a fin structure for improving heat transfer is inserted into the gas channels and opposite ends of the gas channels are open; a body shell including a body part, in which the laminated tube core is accommodated, and a pair of end tank parts integrally provided at opposite ends of the body part; coolant pipes connected to the body shell so as to supply coolant to a periphery of the laminated tube core and to discharge the coolant to an outside; and a pair of flanges respectively fittingly coupled to the pair of end tank parts.