A liquid cooling server includes a chassis including a unit case housing portion; a unit case which moves in a first direction for being inserted in and pulled out from the unit case housing portion and includes a heat generating component and a portion to be cooled; a cooling plate which is disposed to the chassis, opposes the unit case housing portion in a second direction perpendicular to the first direction, and includes a flow path through which a cooling medium flows; a metal portion which is provided to either one of the cooling plate and the portion to be cooled, includes a plurality of first protrusions which protrude in the second direction towards the unit case housing portion and are arranged in the first direction; and a heat transfer body provided between the metal portion and the first member in the second direction, the heat transfer body being elasticity.