A confocal microscope is provided which uses a confocal disk. The confocal microscope includes a light source, a high-NA and low-magnification objective lens which forms an image of the confocal disk obtained by irradiation with a light from the light source on a sample, and a first image formation lens system disposed between the confocal disk and the objective lens. A first image formation lens driving mechanism is provided for moving the first image formation lens system in a light axis direction and adjusting a focal point position of the objective lens with respect to the sample, and a second image formation lens system is provided which forms a sectioning image formed on the confocal disk into an image by photoelectric conversion.