PURPOSE:To enable easy and quick adjustment of parallax. CONSTITUTION:A rotary knob 22 of which the axis is made to intersect the axis L of a scope main body 2 perpendicularly is provided on the outer peripheral surface of the scope main body 2. The rotary knob 22 is provided with a shaft 26 having a cam part 26a. A follower tube 27 so moving longitudinally as to follow the rotation of the cam part 26a is provided on the inner periphery of the scope main body 2. On the outer periphery of a support tube 5, a connecting tube 28 is provided movably. The fore end part of the connecting tube 28 is connected immovably to a movable tube 19. A ring-shaped projecting part 28b is formed in the rear end part of the connecting tube 28 and this ring- shaped projecting part 28b is made to abut on the rear end face of the follower tube 27. A spring 30 actuating the connecting tube forward the fore end side is provided between the connecting tube 28 and the support tube 5.
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