HEAT EXCHANGER

To provide a high-quality heat exchanger in which there is no liquid leakage or the like.SOLUTION: The present invention is intended for a heat exchanger comprising an exterior body 1 and an inner fin 2 housed in the exterior body 1 in a state where a part thereof is in contact with the inner peripheral surface of the exterior body 1. The exterior body 1 is composed of a laminate material L2 in which a resin sealant layer 52 is adhered to the inner surface side of a metal foil layer 51 via a protective adhesive layer 55. The inner fin 2 is composed of a laminate material L2 in which a resin coating layer 62 is laminated on both sides of a metal foil layer 61. A protective layer 55 in the exterior body 1 is configured to remain in a missing part with no sealant layer 52 to...