  0. A quick freezing apparatus comprising:  a freezing store including a door for bringing in or taking out an object-to-be-frozen;  a freezer capable of lowering a temperature inside the freezing store to a temperature equal to or less than approximately −00 degrees centigrade;  a pressure regulator capable of adjusting a gas pressure inside the freezing store; and  a ventilator for sending cold air at a wind velocity of 0 to 0 m/sec toward the object-to-be-frozen placed inside the freezing store,  wherein the pressure regulator comprises a pressurizer for increasing the inside gas pressure to a pressure equal to or more than atmospheric pressure by supplying a pressurized gas into the freezing store, and a depressurizer for decreasing the inside gas pressure to a pressure equal to or less than the atmospheric pressure by drawing the inside gas, and  wherein the 