To provide a lens adjusting structure configured so that while a lens is held in the lens holding cylindrical portion of a lens frame, the inclination and position of the lens can be adjusted relative to the lens holding cylindrical portion.

The lens frame has the lens holding cylindrical portion, in which one end is opened and a flange holding the external portion of the optical faces of the lens is formed at the other end. In the lens frame, the lens adjusting structure configured so that the inclination and position of the lens fitted into the lens holding cylindrical portion can be adjusted relative to the lens holding cylindrical portion, and the flange is provided with an adjustment hole for exposing the external portion of the optical faces of the lens fitted into the lens holding cylindrical portion.