To provide an optical analyzer having a scanning electronic microscope capable of simply changing a sample, and a method of spectroscopic analysis.

The optical analyzer is provided with a sample irradiating part, a sample changing chamber, and a light detector. The sample irradiation part is provided with the scanning electronic microscope, a sample mount for mounting the sample irradiated by electron rays emitted from the scanning type microscope, and a lighting part having a minute hole for passing light emitted from the sample. The optical analyzer is provided with a sample mount moving means between the sample irradiation part and the sample changing chamber.