PROBLEM TO BE SOLVED: To provide a sighting telescope reticle mechanism that is configured to include an LED illumination and optical semi-transmissive thin-plate glass within a lens barrel of a sighting telescope and project an illumination dot on a reticle.SOLUTION: A sighting telescope configured so as to make a sighting mark appear at each location of a first focal plane and a second focal plane is adapted to: set so that centers of collimation marks of the first focal plane and the second focal plane overlap on an optical axis of the telescope and a glass reticle of the first focal plane overlaps on an optical axis of an erecting optical system; have an LED illumination provided in the vicinity of the second focal plane; install an adjustment barrel that has an aperture small hole formed forward in an optical axis direction of illumination light of the LED illumination; and install optical semi-transmissive thin-plate glass so as to tilt to the optical axis of the telescope. The illumination light of the LED illumination passing through the aperture small hole of the adjustment barrel is adapted to overlap on a reversed real image of the first focal plane to be projected on the second focal plane.
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