A liquid jet recording device is provided with a head unit having a liquid pathway having an outlet for forming flying droplets by discharging liquid at the tip portion thereof and an energy generating member provided along the liquid pathway. The device comprises a temperature detecting means provided in a part of the head unit and a heating means, which is controlled by the detection signal from the temperature detecting means and has a larger effective heating area than the bottom area of the head unit, provided on the bottom portion of the head unit. The head unit may be provided with an air chamber in a part of said head unit, a temperature sensor provided in said air chamber and a heater. The head unit may be fixed at the heating means side to a carriage, which comprises an air layer provided between said heating means and the carriage. The head unit may comprise a head cover provided in at least a part of said liquid jet recording head and has an air layer between said head cover and said head.