According to one embodiment, a cooling device includes: a heat transfer unit including a passage, through which a coolant circulates, a heat-receiving section, which is thermally connected to a heating element, and a heat-sinking section for dissipating heat received by the heat-receiving section; a heat dissipation member thermally connected to the heat-sinking section; and a fan that blows air to the heat dissipation member. The heat transfer unit includes: a first plate member, in which a groove corresponding to the passage is formed; and a second plate member, which covers the groove. The heat-receiving section and the heat-sinking section are provided on one of the first and second plate members. The fan is provided on one side of the first or second plate member that is provided with the heat-receiving section and the heat-sinking section.