The spectroscopic ellipsometer, by a computer program incorporated therein, applies voltage to a sample placed on a stage, with a power supply device and conducting probe stands, polarizes multi-wavelength light, with a light polarizer, generated by a xenon lamp and irradiates the polarized light to the sample. The sample is provided with a multilayer film and electrodes formed on a substrate and the sample's surface, and light reflected from the sample is received by the light receiver and measured by the spectrometer. The computer analyzes the optical characteristic of the sample individually for each layer of the multilayer film on the basis of the measurement result and a value calculated from a model which is formed according to the sample structure.