A line mark mounting hole forming tool for forming a mounting hole so that the head portion of the line mark does not protrude to the ground surface.;The tool is rotated by a drive source to drill the drill 20 to drill the drilling hole 21, the drill 20 is coupled to its central portion and the lower end of the drill 20 protrudes from the lower end thereof, It is composed of a cylindrical core drill 30 having a circular blade portion 31 of a size corresponding to the head portion 11 and forming a head hole 22 into which the head portion 11 enters.;The tool of the present invention can form a head hole to which the head portion is coupled so that the head portion of the line mark does not protrude from the ground surface, thereby preventing damage to the line mark due to vehicle traffic.;In addition, the tool of the present invention simplifies the installation work of the line mark by forming a drilling hole and a head hole in a single drilling operation.;Line Mark, Head, Head Hole, Installer, Core Drill
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