Patent ID: 7250597

Claim:
A measuring device including a light source that provides illumination light to a sample, an illumination optical system that leads the illumination light at least through an optical fiber, an imaging optical system that is used for observing an image of the sample, and an image processor that inputs an optical image by an imaging means and carries out image processing, the measuring device comprising: a focus switching means that switches a conjugate relationship of an imaging surface of the imaging means with the sample to a conjugate relationship of the imaging surface of the imaging means with an illumination pupil plane which is an exit surface of the optical fiber; an analyzing means that calculates a light amount irregularity of the illumination pupil plane which is the exit surface of the optical fiber by the image processor; and an optical fiber exit surface position adjusting mechanism that adjusts a position of the exit surface of the optical fiber in the illumination optical system on the basis of an analyzed result of the analyzing means.