Abstract: Provided is a heat exchanger capable of ensuring both heat exchange performance and reliability against corrosion. The heat exchanger includes a plurality of fins each having a flat plate shape, openings provided in each of the plurality of fins, and cylindrical parts arranged on outer peripheries of the openings, each having an inner diameter larger than an outer diameter of each of the openings. The plurality of fins are stacked on one another with the cylindrical parts interposed between the plurality of fins. The openings and the cylindrical parts are configured to form a liquid passage pipe, and the openings protrude further inside than are the cylindrical parts.

Abstract: A heat exchanger and an air-conditioning apparatus that exhibit high performance, and also provide reliability in strength and corrosion resistance. The heat exchanger includes a plurality of fins each including a fin collar formed in a short cylindrical shape by perforating a flat base plate, the plurality of fins being stacked by serially connecting fin collars of the respective fins, the serially connected fin collars being bonded to form a conduit line and a fin core, the conduit line including a resin layer formed on an inner surface thereof. The heat exchanger also includes a reinforcing member having a length corresponding to a length of the conduit line from one end to the other end thereof, to improve rigidity of the conduit line.