Abstract: A heat dissipation device includes a base, a fin array, and an air flow channel. The fin array includes: a plurality of fins protruding in a first direction from the base and arranged side by side in a second direction that intersects with the first direction; and a reinforcing structure coupling two adjacent fins out of the plurality of fins. The air flow channel is surrounded, in the fin array, with the plurality of fins and the reinforcing structure and opens toward an end in the first direction.