PURPOSE: To obtain a frozen meat suppressed in weight loss while retaining taste and looking nice as same as fresh meat when defrosted by charging the frozen meat into a water tank and applying air bubbles to the meat and simultaneously irradiating the meat with far-infrared ray while keeping water temperature to constant.

CONSTITUTION: A frozen meat is charged into a water tank equipped with a piping for cooling medium 8, air-diffusing tube 10, titanium heater 12 and far-infrared ray ceramic sheet 17. Air bubbles generated from the air-diffusing tube 10 are applied to the frozen meat charged into the water tank, e.g. kept to 5-8°C and simultaneously the frozen meat is irradiated with far-infrared ray from a far-infrared ray ceramic sheet 17 installed on the side of the water tank 1 to defrost the frozen meat.