PURPOSE: To reduce the size of the eyesight adjustable finder by using an optically transparent elastic body for the convex lens of an ocular lens, and pressing the peripheral part of one curved surface which contacts air and varying the refracting power.

CONSTITUTION: The ocular lens 12 consisting of the convex lens 10 and a concave lens 11 has its refracting power matched with persons having normal eyesight. The convex lens 10 is made of the elastic body, the hard and transparent convex lens 11 is brought into contact with one surface of the lens and mounted on a storage member 13, and a pressure member 14 contacts the peripheral part of the curve surface of the convex lens 10 contacting air. When the pressure member 14 is screwed in the storage member 13 through a screw part 15, the convex lens 10 deforms according to the pressure application to increase the refracting power and matches with long eyesight, and when the pressure member 14 is loosened, the lens decreases in refracting power and matches with short eyesight.