Patent ID: 8743472

Claim:
A lens device comprising: an approximately cylindrical first lens frame having a lens group supported therein; a second lens frame having a cylindrical part with an inner diameter larger than an outer perimeter of the first lens frame; an annular member to be mounted on the first lens frame; an elastic member disposed between a side wall of a recessed part formed on the outer perimeter of the first lens frame and a rib projecting to an inner perimeter side of the second lens frame; and a cylinder having the second lens frame fixed thereto, wherein with the rib of the second lens frame being interposed between the annular member and the elastic member, the second lens frame is mounted on the first lens frame so that the cylindrical part covers at least a part of the first lens frame, a projection is formed on the first lens frame or the second lens frame, and the first lens frame and the second lens frame are in contact with each other at the projection, screw holes radially penetrating through the second lens frame are formed on the second lens frame in a plane including an optical axis of the lens group and at a position a predetermined distance away from a position where the first lens frame and the second lens frame are in contact with each other at the projection, and to the screw holes, a screw capable of pressing an outer circumferential surface of the first lens frame is screwed.