To provide a lens frame structure whose structure is simple and by which the fine adjustment of a lens position is stably performed.

A lens main body 3 is fixed at a lens holding frame 2, and it abuts on a reference frame 1 at the supporting parts 21 and 22 of the lens holding frame 2. Inclining movement and shifing movement are independently performed by the supporting parts 21 and 22. Also, rotating movement is independently performed. The lens holding frame 2 is fixed at the reference frame 1 by an adhesive 4 after performing alignment so that the optical characteristic of an entire optical system is set to be an optimum value by using movements thereof.