The invention protects a front end (2) of an objective lens (4) from extreme external force in a non-operating state. There is provided an objective lens protector mounted on an objective lens or a microscope main body having the objective lens mounted thereon. The objective lens protector includes a covering member (6) movable between a protecting position where a front end of the objective lens is covered in a non-operating state and an operating position where the front end of the objective lens is exposed in an operating state.