Optical microscope apparatus using convergent beam as illumination light

The optical microscope apparatus comprises illuminating means for emitting as illumination light a convergent beam converging at a point in a space; a sample mounting table for mounting a sample in front of the converging point of illumination light; and an objective lens disposed such that the illumination light is incident thereon after light transmitted through or reflected by the sample is once converged at the converging point. The texture and state of orientation of the sample can easily be analyzed by use of the optical microscope apparatus in accordance with the present invention.