To provide a lens device for a finder which does not have to make a viewfinder body large even when an image display device of a large size is used in a viewfinder for a video camera, or the like.

This device consists of a convex lens 1 whose focal distance is f1, a concave lens 2 whose focal distance is -f2 (f1<f2) and a lens-barrel 3. The lens 2 is fixed to the side opposite to an eye point A and the lens 1 is supported in a movable way in the direction of an optical axis between the lens 2 and the point A. Because a focal distance of the lenses can be extended in relation to the lens 1, sufficient visual field is secured with a large- sized cathode-ray tube 4 without making the diameter of the lenses large. Thus, it is possible to reduce cost by making parts common. Also, a viewfinder that is small-sized and has good balance against a camera body is obtained because the lenses and the lens-barrel 3 and a finder body 5 do not have to be made large.