Heat exchanger for an aircraft engine

The deformation of the heat radiation fins can be suppressed by an external force, to provide a heat exchanger. Heat exchanger of the embodiment (1) can be placed along the curved surface of an aircraft engine. Heat exchanger (1) includes a body (10), a plurality of heat dissipating fins (20), and a lid member (50). Body (10) includes a fluid can flow flow path in the interior, has a back surface (3) facing the curved surface, a back surface (3) and the opposite surface (2). Body (10) is curved to correspond to the curved surface of an aircraft engine. A plurality of heat dissipating fins (20) are arranged on the surface (2) of the body is exposed to the airflow. The lid member (50) is fixed to the upper end of the plurality of radiating fins (20).