PROBLEM TO BE SOLVED: To provide a laser oxygen gas analyser which performs concentration measurement using a wavelength indicating sensitivity to a high-temperature oxygen gas contained in a measuring object gas and which does not require heating a gas and a correction gas cell to a high temperature at 400°C or higher in correction and further does not require maintaining the high temperature of the gas and the correction gas cell in field work. ! SOLUTION: Oxygen concentration can be measured only by a wavelength indicating sensitivity to only a high-temperature measurement gas used in concentration measurement and a wavelength having an absorption intensity sufficient for an adjacent normal temperature oxygen gas. This allows indirect correction of a deviation of the wavelength having sensitivity only to the high-temperature oxygen gas by correcting a deviation caused by a secular change of the wavelength having an absorption intensity sufficient for the normal temperature oxygen gas. Thus, a correctio
