Problem to be solved: to obtain a heat sink capable of suppressing the temperature rise of the heat generating element during operation and suppressing the erosion and corrosion by cooling water compared to the conventional one.Solution: in the heat sink 1 for cooling the elements to be heated at the time of operation, there are provided a main body provided with an internal channel for supplying cooling water into the interior and a plurality of pin fins 32 projecting from the side surface constituting the internal channel.A plurality of pin fins 32 having parallel quadrilateral shapes are arranged in a plane perpendicular to the extending direction so as to cross the first channel 33 extending in the first direction and the second channel 33 extending in the second direction crossing the first direction.The ratio of the height to the width of the first and second passages 33 and 33 is 5 or more.Diagram
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