A heat-exchanger heat sink (1; 102; 103; 104) includes a plurality of fin plates (2; 202; 203; 203a, 203b; 205), which are lined up spaced apart from one another in a plate-thickness direction; and at least one linking part (3; 3a, 3b; 304), which is disposed such that it intersects and hold the plurality of fin plates (2). The at least one linking part has a base (31), which may be rod or bar shaped, and a plurality of positioning protrusions (32), which protrude from a side surface of the base. Each of the fin plates has at least one latching groove (21, 26), into which the base is inserted such that each fin plate is located between adjacent positioning protrusions of the at least one linking part.