A liquefied gas storage tank comprising: a tank main body configured to store liquefied gas, having a partition wall separating an inside and an outside of the tank main body; a support member configured to support the tank main body, wherein a part of the partition wall of the tank main body of the tank is formed by a joining member to which the support member supporting the tank main body is joined; a precooling part configured to precool the tank main body; a gas feeder configured to feed the liquefied gas to the tank main body; a liquefied gas-based rapid cooling possibility determination device; a joining member that forms a part of the partition wall, the joining member to which the support member is joined; a first temperature detection unit configured to detect a temperature of the partition wall by detecting a temperature of the joining member; and a second temperature detection unit configured to detect a temperature of the support member; wherein the liquefied gas-based rapid cooling possibility determination device comprises: a temperature difference acquisition unit configured to acquire a temperature difference (ΔT) between the temperature of the joining member which is detected by the first temperature detection unit and the temperature of the support member which is detected by the second temperature detection unit; and a determination unit configured to determine whether or not a joint between the tank main body and the support member is rapidly cooled by the liquefied gas, on the basis of at least two of the temperature of the joining member, the temperature of the support member, and the temperature difference (ΔT), and wherein the determination unit is configured to determine whether or not the joint between the tank main body and the support member is rapidly cooled by the liquefied gas, on the basis of whether or not the temperature of the partition wall or the temperature of the support member and the temperature difference (ΔT) are within a range within which stress generated at a joint between the tank main body and the support member when the tank main body is cooled by the liquefied gas is set to be lower than or equal to a predetermined reference value. a tank main body configured to store liquefied gas, having a partition wall separating an inside and an outside of the tank main body; a support member configured to support the tank main body, wherein a part of the partition wall of the tank main body of the tank is formed by a joining member to which the support member supporting the tank main body is joined; a precooling part configured to precool the tank main body; a gas feeder configured to feed the liquefied gas to the tank main body; a liquefied gas-based rapid cooling possibility determination device; a joining member that forms a part of the partition wall, the joining member to which the support member is joined; a first temperature detection unit configured to detect a temperature of the partition wall by detecting a temperature of the joining member; and a second temperature detection unit configured to detect a temperature of the support member; a temperature difference acquisition unit configured to acquire a temperature difference (ΔT) between the temperature of the joining member which is detected by the first temperature detection unit and the temperature of the support member which is detected by the second temperature detection unit; and a determination unit configured to determine whether or not a joint between the tank main body and the support member is rapidly cooled by the liquefied gas, on the basis of at least two of the temperature of the joining member, the temperature of the support member, and the temperature difference (ΔT), and wherein the determination unit is configured to determine whether or not the joint between the tank main body and the support member is rapidly cooled by the liquefied gas, on the basis of whether or not the temperature of the partition wall or the temperature of the support member and the temperature difference (ΔT) are within a range within which stress generated at a joint between the tank main body and the support member when the tank main body is cooled by the liquefied gas is set to be lower than or equal to a predetermined reference value.