In order to suppress pressure rise in a storage tank for storing liquefied gas, simplify a facility and lower the cost of the facility, a pressure rise suppression device for a storage tank is provided with: the storage tank (2) in which liquefied gas is stored; a heat exchange means (4) in which the liquefied gas in a liquid state extracted from the storage tank (2) and a refrigerant exchange heat with seach other; a refrigerant compression means (31) which compresses the refrigerant led to the heat exchange means (4); a refrigerant expansion means (33) which reduces the pressure of the refrigerant compressed by the refrigerant compression means (31) and supplies the refrigerant to the heat exchange means (4), and a supply means (11) which supplies the liquefied gas in the liquid state cooled in the heat exchange means (4) to the liquefied gas in the liquid state in the storage tank (2).
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