A liquid immersion tank includes a housing configured to house a heat generator, a gutter provided over the housing, and configured to form a flow path through which a coolant flows, a flow rate adjuster provided at an outflow port through which the coolant flows out from the flow path, and configured to adjust an outflow amount of the coolant, a slope provided over the housing, and configured to include a down-flow surface through which the coolant branched from the flow path flows down toward the housing, the coolant flowing through the flow rate adjuster, and a tank configured to accommodate the housing.