<p>[PROBLEMS] To provide not a polarizer having a liner polarization axis but a novel polarizer not influenced by polarization state conversion attributed to a lens and so forth (removal) when used in a polarization microscope and a polarization microscope in which a novel polarizer is used and light is ideally blocked when a sample having no polarization conversion action is observed. [MEANS FOR SOLVING PROBLEMS] The above problem is unavoidable when a lens is constituted of a curved surface rotationally symmetric with respect to the optical axis and the polarizing axis is linear. Therefore, the problem can be fundamentally solved by using a polarizer having a transmission axis rotationally symmetric with respect to the optical axis similarly to the lens. That is, the problem can be solved by using a polarizer having a concentric transmission axis or a redial transmission axis in a polarization microscope.</p>
