Abstract: A sighting scope 1 includes; a scope body 2; an outer frame 3 covering at least a middle portion along an optical axis of the scope body; a rotational support structure which rotatably support the scope body 2 around a rotational axis located on a plane orthogonal to the optical axis in the outer frame; a rotational sliding contact portion which is placed between the scope body and one of opening edges at ends of the outer frame located on front and back sides of the rotational axis along the optical axis, and which is designed to be able to slide around the rotational axis; and an angular adjustment mechanism which can adjust an inclined angle of the scope body with respect to the outer frame.