FIN MEMBER FOR HEAT EXCHANGER

A fin member for a heat exchanger is configured in such a manner that swollen sections of the fins of the fin member are adapted to be in stable contact with each other to prevent the contact sections between the fins from riding over each other and also prevent a pipe member from being displaced in the radial direction. As a result of the configuration, the pipe member is stably mounted to the fin member, and this increases the area of the contact between the fin member and the pipe member and the area of the contact between folded sections of the fins to improve the heat exchange performance. A plate material is repeatedly folded over itself into a corrugated shape to form corrugated fins. The folded sections (3) which are formed by the folding are pressed and deformed into a recessed shape to form engagement recesses (4). A pipe member (5) through which fluid flows is disposed at the engagement recesses (4). The pressing and deformation of the engagement recesses (4) cause swollen sections (6) to protrude at both sides of each folded section (3) with respect to the folding-over direction of the folded section (3) and form flat butt surfaces (7) at the tips of the swollen sections (6). Adjacent butt surfaces (7) are caused to be in surface contact with each other with the pipe member (5) disposed at the engagement recesses (4).