Abstract: In an ebullition cooling device, one opening of each of through holes faces an uneven surface, and the other opening of each of the through holes is opened to a space on a side opposite to the uneven surface. At least the uneven surface of a heat transfer wall and a metal porous body are immersed in a refrigerant liquid. The uneven surface of the heat transfer wall is a vertical surface or an inclined surface having a height position that changes in one direction along which grooves extend, and at least one end, at a higher position, of opposite ends of each of the grooves in the direction along which the grooves extend is opened.

Abstract: A heat sink structure includes: a corrugated fin that is made of metal, and has a cross section in a wave form and a plate surface in which a plurality of through holes are opened; heat absorbing portions and that absorb heat from a cooling target object and transmit the heat to the corrugated fin; and a fluid flow path that allows cooling fluid to be supplied toward the plate surface of the corrugated fin and allows the cooling fluid to flow along the through holes. The heat transmitted from the heat absorbing portions and to the corrugated fin is radiated in the cooling fluid passing through the through holes.

Abstract: A fan-equipped heatsink includes: a heat receiving substrate made of metal; a centrifugal fan disposed on an upper surface side of the heat receiving substrate; a plate-shaped wall that is made of metal, is provided so as to stand at a position, on the upper surface of the heat receiving substrate, which is around and opposed to an outer peripheral portion having an air discharge opening of the centrifugal fan, and are provided with a plurality of through-holes that are open in a plate surface opposed to the centrifugal fan; and a lid member fixed to an upper end of the plate-shaped wall 4 and configured to close a space on the inner side of the plate-shaped wall.