An integrated polarization interferometer includes a polar­ ization beam splitter for separating incident complex waves, a first mirror attached to a first surface of the polarization beam splitter, for reflecting a first polarization transmitted through the polarization beam splitter to the polarization beam splitter, and a second mirror attached to a second surface of the polarization beam splitter, for reflecting a second  polarization  transmitted  through  the polarization beam splitter to the polarization beam splitter. Accordingly, it is possible to measure dynamic spectroscopic polarization phenomenon with extremely high robustness disturbances due to  an  external vibration  and  the like by  using  the integrated  polarization  interferometer,  thereby  improving measurement repeatability and accuracy of measurement.