In the heat sink 1, the fin plates 2 and the linking part 3 can be manufactured separately; consequently, compared with preexisting heat sinks that are integrally formed by extrusion, there are fewer restrictions on the shape, the tilt, and the like of the fin plates 2, the spacing between adjacent fin plates 2, and the like. Therefore, in the heat sink 1, the number of degrees of freedom in the design can be increased over what it was in the past.

In addition, the heat sink 1 can be assembled using a simple operation in which the base 31 of the linking part 3 is inserted into the latching grooves 21 of the fin plates 2. Therefore, the heat sink 1 can be assembled and manufactured with increased productivity as compared to known methods for manufacturing fin-plate heat sinks.

In addition, in the heat sink 1, the plurality of fin plates 2 can be held merely by inserting the base 31 of the linking part 3 into the latching grooves 21 of the fin plates 2. Thus, the positioning protrusions 32 of the linking part 3 reduce or eliminate the possibility of mispositioning (misalignment) of the fin plates 2 in the transverse direction Y. In addition, the base 31 of the linking part 3 reduces or eliminates the possibility of mispositioning (misalignment) of the fin plates 2 in the longitudinal direction X.