Heat receiving apparatus, cooling apparatus, and electronic apparatus

A heat receiving apparatus of the embodiment of the present invention is provided with a heat receiver that includes: a case, which has a flow channel inside thereof, said flow channel having a cooling medium circulating therein, and which transfers heat from a heat generating component disposed outside; and a valve, which is capable of changing the cross-sectional area of a part of the flow channel in a state wherein the cooling medium is circulating in the flow channel.