A method of measuring characteristic data for a multilevel optical recording medium, comprising measuring (steps 31−33) characteristic data for a multilevel optical recording medium (1) by using a two−value recording/reproducing evaluation device. This multilevel optical recording medium (1) is so produced as to be capable of multilevel recording with light reflectance with respect to a reproducing laser beam controlled in multiple stages by switching at least one of a recording laser beam irradiation time and an irradiation power and by changing the transmittance of a recording layer (12) by a recording laser beam. Accordingly, since characteristic data for a multilevel optical recording medium (1) can be measured without newly purchasing or producing a dedicated multilevel recording/reproducing evaluation device, the measuring costs can be reduced.
METHOD OF MEASURING CHRACTERISTIC DATA FOR MULTILEVEL OPTICAL RECORDING MEDIUM, AND EVALUATION METHOD FOR MULTILEVEL OPTICAL RECORDING MEDIUM