A laser microscope is provided, which is low in manufacturing costs and compact in structure. A laser beam emitted from a semiconductor laser is converted into a rectilinear light beam which has divergence in one direction by use of a micromirror device. The micromirror device comprises a plurality of micromirrors arranged in a two-dimensional array, and each micromirror is vibrated at a high speed by a driving pulse. Since each micromirror is movably supported by a hinge, a mirror layer of the micromirror is displaced in a curved manner by the electrostatic attractive force caused by the driving pulse. By this curved displacement of the mirror layer, each micromirror operates as a cylindrical mirror to convert an incident laser beam into an incoherent light beam which diverges in one direction. The rectilinear beam is projected to a sample through a beam deflection device and an objective lens, and a reflected light from the sample is made incident on a linear image sensor. Since the micromirror device is relatively low in costs and a relatively large diverging angle is obtained, the laser microscope low in manufacturing costs and compact in structure can be achieved.