Such heat sinks are often configured as a plate-fin heat sink, in which multiple fin plates extend vertically (perpendicularly) from a base plate. In the past, this type of heat sink has been manufactured by extrusion. However, because there are restrictions on the shapes that can be manufactured with extrusion techniques, it is difficult to manufacture, for example, a heat sink in which the plate thickness of the fin plates is relatively thin, a heat sink in which the tongue ratio (i.e. the ratio of the height to the pitch of each fin plate) is large, or the like. Thus, in previously-known techniques, the restrictions on, for example, the shape, the pitch, the tilt, and the like of the fin plates disadvantageously decrease the number of degrees of freedom in the design of the heat sink.

Accordingly, to increase the number of degrees of freedom in the design of the heat sink, Japanese Laid-open Patent Publication 2013-116473 discloses a technique in which the fin plates and the base plate are separately prepared and are then integrated (joined) by brazing. In addition, Japanese Laid-open Patent Publication 2015-126050 and its counterpart US 2015/0189791 disclose a technique in which multiple fin plates are disposed such that they are spaced apart and parallel to one another and then are linked by rod-shaped linking members.

However, in the heat sink of JP 2013-116473, brazed parts between the fin plates and the base plate are remelted when brazing to the jacket. Therefore there is a risk that tilting, mispositioning, or the like of the fin plates will occur while brazing the jacket, which is undesirable because it could lead to a decrease in the cooling performance of the heat exchanger.