1. A method for adjusting a confocal microscope which includes a microscope unit and a confocal scanner unit of Nipkow disk type, emits a light beam for image measurement on a sample, images a returned fluorescent light of the light beam by a CCD (charge-coupled device) digital camera as a confocal image, and enables observation of the sample by the confocal image, the method comprising: matching a phase of rotation of the Nipkow disk with a phase of an exposure time of the CCD digital camera.