The present invention aims to provide an object lens protector for a surgical microscope, which is provided with a projection window fixed at a predetermined angle on a protective cover which covers the entire microscope, and the projection window is disposed on the body of the object lens protector, which is disposed under the object lens. As a result, the present invention eliminates the need to rotate the projection window in order to prevent light from a lighting lamp reflecting onto the area of the object lens, thereby allowing elimination of the elements required for rotating the projection window, which can improve the productivity of the object lens protector and reduce production costs therefor promotes easier use as a result of being able to use a position setting portion which is provided on the body of the protector, and a position determining portion which is provided on the frame of the object lens for easily placing the protector on the frame of the object lens and can resolve the inconvenience of a surgeon having to adjust the projection window through rotation, by setting and fixing the projection window at an angle so that light dos not reflect onto the area of the object lens when the protector is placed on the frame of the object lens. To this end, the protector of the present invention, which is provided on the protective cover (102) applied to the entire surgical microscope (101) for magnifying and observing the affected area of a patient, and which is coupled to the object lens frame (103) for protecting the object lens, comprises: a body (10) having on the lower end thereof an outward flange (11) that is coupled to the protective cover (102), a tilted surface (12) tapered to the upper end of the body, and a securing projection (13) that is tilted at the same angle as the tapered tilted surface (12) and protrudes from the inner surface of the upper end of the body a coupling protrusion (20) that extends from the outer circumference of the body
