The aseptic liquefied gas production apparatus of the present invention includes a liquefied gas storage tank, a source gas supply device that supplies a source gas to the liquefied gas storage tank, and a cooling that liquefies the source gas by cooling the inside of the liquefied gas storage tank. The apparatus, the supply pipe connecting the source gas supply apparatus and the liquefied gas storage tank, the sterilization filter provided in the supply pipe, and the sterilization region located downstream of the sterilization filter are heated with high-temperature saturated steam. A sterilizing apparatus for sterilizing； and a drying apparatus for removing moisture generated by the heat sterilization and drying the sterilized region.本発明の無菌液化ガス製造装置は、液化ガス貯留タンクと、前記液化ガス貯留タンクに原料ガスを供給する原料ガス供給装置と、前記液化ガス貯留タンク内を冷却して前記原料ガスを液化する冷却装置と、前記原料ガス供給装置と前記液化ガス貯留タンクとを接続する供給配管と、前記供給配管に設けられる滅菌フィルタと、前記滅菌フィルタよりも下流部分に位置する滅菌領域を高温飽和水蒸気により加熱滅菌する滅菌装置と、前記加熱滅菌により生じた水分を除去して前記滅菌領域を乾燥させる乾燥装置とを有する。
