In addition, working example 1 and working examples 3-5 describe examples in which, after the heat sink 1, 103, 104 and the like are assembled, the fin plates 2, 203, 203a, 203b, 205 are not crimped to the linking part(s) 3, 3a, 3b, 304. However, after the linking part(s) 3, 3a, 3b, 304 has (have) been attached to the fin plates 2, 203, 203a, 203b, 205, the fin plates 2, 203, 203a, 203b, 205 may be crimped in the same manner as in working example 2. In this case, in addition to the functions and effects of these working examples, it is also possible to achieve the functions and effects produced by the claw parts.

In addition, working example 6 describes an example of a heat exchanger in which both end surfaces 22 of the fin plates 203 in the plate-width direction are joined by brazing to an inner surface of the jacket 41. However, for example, just the end surfaces 22 that make contact with the top wall 431 may be brazed. In this case, the end surfaces 22 on the side of the bottom wall 42 of the fin plates 203 may be separated (spaced apart) from the inner surface of the bottom wall 42.