A light beam (b) guided via a zoom optical system (13) from an objective optical system (9) is split into two light beams by a beam splitter (19), and one of the beams is guided to an eyepiece optical system (31) and the other is guided to a camera (38), so that the situation of a surgical site watched by a surgeon (A) precisely coincides with a video captured by the camera (38). Moreover, displaying an electronic video captured by the camera (38) on a pair of right and left liquid crystal panels (48) within a device main body (5) and taking a beam (e) from the liquid crystal panels (48) into the eyepiece optical system (31) enable the surgeon (A) to three-dimensionally check the video captured by the camera (38) without changing his/her body posture during the surgery.
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