A heat sink includes: a heat sink body made of a metal material which includes a plurality of heat radiating fins having a flat plate shape, the heat radiating fins being arranged parallel to each other on one surface side of a base having a flat plate shape at intervals in a direction along a surface of the base; and a bridge member made of a metal material which has a plurality of grooves parallel to each other, the grooves being formed at a pitch equal to an arrangement pitch of the heat radiating fins of the heat sink body, and the grooves accommodating distal ends of the respective heat radiating fins in a press-fitted state.