An EGR (exhaust gas recirculation) cooler includes a cylinder block having a mounting space and having a coolant inlet in which a coolant can flow into the mounting space and a coolant outlet in which the coolant can be exhausted. A cover plate covers the mounting space and forms an exhaust inlet though which the exhaust gas can flow in and an exhaust outlet through which the exhaust gas can be exhausted. Tubes are mounted in the mounting space and through which the exhaust gas can flow. An inlet tank is mounted in the mounting space and is configured to distribute the exhaust gas flowing through the exhaust inlet of the cover plate to the tubes. An outlet tank is mounted in the mounting space and is configured to guide the exhaust gas exhausted from the tubes to the exhaust outlet of the cover plate.