Optische visiereinrichtung

Abstract

An optical sighting device (10) used by being installed to a firearm includes: an objective system part (12), forming an inverted image of a target object on a first focal plane; and an erect system part (14), forming an erect image obtained by reversing the inverted image on a second focal plane. The erect system (14) has: lenses (112) to (116) arranged between the first focal plane and the second focal plane; and a movable cylinder (134) as an erect system cylinder holding the lenses (112) to (116). The adjustment mechanism (20) is a mechanism for adjusting tilting of an axial direction of the movable cylinder, and has: an advancing-retracting shaft (204) as an advancing-retracting member advancing and retracting on an end side of the movable cylinder (134); and a spring (206) as a double torsion spring biasing the movable cylinder (134) toward the advancing-retracting shaft (204).