OBSERVATION DEVICE

PROBLEM TO BE SOLVED: To enable the common use of a fiber scope and a bore-scope and to provide an observation device having excellent operability by exchanging an image fiber and a rod lens for each other. SOLUTION: A guide connector 30 for supporting the basic end parts of an image guide 3a and a light guide 3b is freely attachably/detachably mounted on one side of a casing 2 holding a lens barrel. The guide connector 30 is fixed by tightening a tightening ring 35 provided on the guide connector 30 to a fixing ring 26 projectingly provided on the casing 2 and, at this time, the positioning of the image guide 3a on the optical axis is realized with high accuracy by engaging/supporting a holding sleeve 31 for holding the basic end of the image guide 3a with a supporting hole 41 being opened on the optical axis.