PROBLEM TO BE SOLVED: To provide a method of forming an inexpensive acidic liquid which improves disinfecting, pasteurizing and sterilizing effects and an apparatus utilizing the acidic liquid formed.SOLUTION: An apparatus for disinfection, pasteurization and sterilization of the surface of an object to be treated has a first electrode and a second electrode which are arranged in an airtight container and applied with a voltage, and conducts low-cost disinfection, pasteurization and sterilization of the surface of the object by means of a method of forming a condensed acidic liquid of a pH of 2.0 or lower by generating vapor with electric discharge through water or an aqueous solution between the first and second electrodes and causing the vapor to be condensed on the surface of the object contained in the airtight container.COPYRIGHT: (C)2016,JPO&INPIT【課題】安価で消毒、殺菌、滅菌効果を高める酸性液の生成方法及び生成された酸性液を利用する装置を提供すること。【解決手段】気密密閉容器内に配置されて電圧を印加される第1電極及び第2電極を有し、前記第1電極及び前記第2電極との間に水または水溶液を介しての放電により発生した蒸気が前記気密密閉容器内に収納されてる被処理物の表面に凝集してpH2.0以下の凝縮酸性液を生成する方法を利用して、安価に被処理物の表面の消毒、殺菌、滅菌を目的とした装置であることを特徴とする。【選択図】図1