A freezing detection device to be applied to a liquid cooling apparatus including a liquid tank for storing a liquid whose freezing is to be detected, a cooling unit located inside the liquid tank to cool the liquid and an agitator configured to stir the liquid stored in the liquid tank, the freezing detection device comprising: a temperature detecting unit located at a predetermined distance from the cooling unit; and a determining unit configured to determine whether or not the liquid has frozen around the temperature detecting unit based on an output from the temperature detecting unit, characterized in that the determining unit determines whether or not the liquid has frozen around the temperature detecting unit based on whether the output from the temperature detecting unit is fluctuating or not due to temperature difference of the liquid colliding with the temperature detecting unit, wherein the determining unit determines that the liquid has not frozen around the temperature detecting unit when the output from the temperature detecting unit is fluctuating, and determines that the liquid has frozen around the temperature detecting unit when the output from the temperature detecting unit is not fluctuating, wherein the determining unit is configured to collect a predetermined amount of temperature data over a predetermined period of time and to add up absolute values of difference between temporally-adjacent temperature data so as to calculate the sum of the absolute values, and wherein the determining unit is further configured to determine whether or not the sum is greater than or equal to a predetermined threshold value and to determine that the output from the temperature detecting unit is fluctuating when the sum is greater than or equal to the predetermined threshold value and determine that the output from the temperature detecting unit is not fluctuating when the sum is less than the predetermined threshold value. a temperature detecting unit located at a predetermined distance from the cooling unit; and a determining unit configured to determine whether or not the liquid has frozen around the temperature detecting unit based on an output from the temperature detecting unit, characterized in that the determining unit determines whether or not the liquid has frozen around the temperature detecting unit based on whether the output from the temperature detecting unit is fluctuating or not due to temperature difference of the liquid colliding with the temperature detecting unit, wherein the determining unit determines that the liquid has not frozen around the temperature detecting unit when the output from the temperature detecting unit is fluctuating, and determines that the liquid has frozen around the temperature detecting unit when the output from the temperature detecting unit is not fluctuating, wherein the determining unit is configured to collect a predetermined amount of temperature data over a predetermined period of time and to add up absolute values of difference between temporally-adjacent temperature data so as to calculate the sum of the absolute values, and wherein the determining unit is further configured to determine whether or not the sum is greater than or equal to a predetermined threshold value and to determine that the output from the temperature detecting unit is fluctuating when the sum is greater than or equal to the predetermined threshold value and determine that the output from the temperature detecting unit is not fluctuating when the sum is less than the predetermined threshold value.