Fins (30) of a heat exchanger each have a tube receiving opening (33) into which a heat transfer tube is inserted. Each of the fins (30) is provided with a collar (32) rising from an edge of the tube receiving opening (33). Open end-side protruding tabs (40a) and closed end-side protruding tab (40b) of the collar (32) make contact with an adjacent one of the fins (30) to maintain the interval between fin bodies (31). The collar (32) has longer side joint portions (50) smaller in height than the open end-side protruding tabs (40a). The longer side joint portions (50) are joined to the heat transfer tube. The open end-side protruding tabs (40a) are smaller in length than the longer side joint portions (50).
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