The objective of the present invention is to obtain a heat exchanger and an air conditioning device which deliver, in addition to good performance, reliability in terms of strength and anticorrosion. This heat exchanger is provided with fins, wherein each fin comprises a plate-type substrate upon which short tubular fin collars are provided with holes running respectively therethrough. The fin collars are lined up and connected to line up the plurality of fins, and the connected fin collars are joined to form pipes and a fin core. A resin layer is formed on the inner surface of each pipe. The heat exchanger is also provided with a reinforcement member which extends from one end of the pipe to the other end of the pipe and improves the rigidity of the pipe.
