The present invention relates to a stereo microscope system, at least by using a single optical axis an optical system with only a single camera image through a first beam path acquired by the camera with the first image through the second beam path have the same coordinates It is characterized in that it is not necessary to correct the image to be matched when the images, it does not require mechanical compensation for fitting the camera coordinates. According to the present invention, not only can provide a stereoscopic image to minimize the loss of stereoscopic effect, to minimize eye strain during observation of the three-dimensional image makes it possible to observe the three-dimensional image more comfortably.