COOLING DEVICE FOR HEAT-GENERATING ELEMENT

A cooling apparatus for a heat-generating element, includes: a heat sink (5) on which the heat-generating element (2) is mounted; a cooling component (6) having a recess (61), the cooling component and the heat sink (5) being faced and joined to each other so that the recess (61) forms a coolant passage (7) in which a coolant flows; and a sealing member (8) provided between the heat sink (5) and the cooling component (6) so as to seal the coolant passage and separate an interior and exterior of the coolant passage (7). A first distance is longer than a second distance with regard to a distance between facing surfaces of the heat sink (5) and the cooling component (6) near the sealing member (8), the first distance is a distance between the facing surfaces at an interior side of the coolant passage (7) separated by the sealing member (8), and the second distance is a distance between the facing surfaces at an exterior side of the coolant passage (7) separated by the sealing member (8).