[Object] To provide a quick freezing apparatus and method making it possible to prevent a subtle reaction between an object-to-be-preserved and a gas inside its freezing store to prevent deformation and deterioration of the object-to-be-preserved as much as possible and freeze-preserve the object maintaining its freshness and quality at a high standard for a long term, and thereby applicable to a long-term preservation of a living tissue. [Configuration] A quick freezing apparatus includes a freezing store 11 including a door for bringing in or taking out an object-to-be-frozen 3, a freezer 17 capable of lowering a temperature inside the freezing store to a temperature equal to or less than approximately -30 degrees C, a pressure regulator 60 capable of adjusting a gas pressure inside the freezing store, and a ventilator 31 for sending cold air at a wind velocity of 1 to 5 m/sec toward the object-to-be-frozen placed inside the freezing store. The pressure regulator 60 includes an actuation controller 68 for detecting the temperature inside the freezing store if the detected inside temperature is equal to or more than a predetermined value, then actuating a depressurizer 62 to decrease the inside gas pressure to a pressure equal to or less than the atmospheric pressure and when the inside temperature exceeds the predetermined value, stopping the depressurizer 62 and actuating the pressurizer 61 to increase the inside gas pressure to a pressure equal to or more than the atmospheric pressure.
