To provide a compact EGR cooler capable of efficiently cooling EGR gas without increasing a load of an engine cooling system.

In an engine equipped with a water-cooled type cooler 2 in which engine cooling water is circulated and supplied to an EGR pipe 1 leading to an intake air system branched from an exhaust gas system, a pipe 3 with a fin provided with a fin 3a and 3b at least one side of a periphery or an inner circumference constitutes at least some part of the EGR pipe 1 leading to the water-cooled type cooler 2 from the exhaust gas system. Then, the EGR gas supplied into the water-cooled type cooler 2 is pre-cooled by the pipe 3 with a fin to enlarge a cooling (heat exchange) capacity as a whole cooler.