To enable adjusting a distance again without peeling adhesive off after holding a lens group by the adhesive, as for the optical adjustment.

A lens frame for a rear group as a conventional 1st frame is divided into a rear group lens frame 2 and a connecting member 3, and the connecting member 3 is screw-connected to the lens frame 2 so that it may be adjusted by shifting in an optical axis, and also, it may be adjusted by shifting in a direction orthogonal to the optical axis L with reference to a guide ring 1 for a 2nd frame 6. Besides, after adjusting the optical axis, a distance correction spacer 7 is installed between the connecting member 3 and the rear group lens frame 2 as necessary, and then, the connecting member 3 and the guide ring 1 are joined together by the adhesive 8.