To provide a boiling cooler efficiently cooling a heating element, even when a refrigerant tub is used in a head and tail direction posture in addition to a horizontal direction posture independently of a position of the heating element to the refrigerant tub.
The boiling cooler equipped is with: a refrigerant tub 110 in which a heating element 10 is attached on an external surface of one wall 111 out of two facing walls 111, 112 and refrigerant is stored in an interior thereof; and a radiator 120 which is provided on an external surface of another wall 112 out of two walls 111, 112 and returns the refrigerant to the refrigerant tub 110 after flowing the refrigerant boiled and vaporized by the heating element 10 in an interior thereof and condensing the refrigerant. There is provided, on an interior side of one wall 111, a primary wick 131 from a region where the primary wick 131 serves as a bottom when two walls 111, 112 are used in the head and tail direction posture to a region where the heating element 10 is arranged.
MIYAJIMA NORIYOSHI
OKAMOTO YOSHIYUKI
OGURA TAKASHI
