A boring instrument guiding device which is used to guide a boring instrument that forms a pilot hole for embedding a pedicle screw in a vertebral pedicle includes a reference pin which is used as a reference by being inserted into the vertebral arch from the rear to the front of a spine, and an arm which extends sideward from the proximal end side of the reference pin, and is characterized in that a plurality of guide holes, each of which is opened toward the tip position of the reference pin to guide the boring instrument, are formed in the arm in a radial pattern centered at the tip position of the reference pin. It is possible to provide a boring instrument guiding device which is capable of more easily and precisely guiding the boring instrument.
