Drill and production method thereof

摘要

A drill comprising a chip discharge groove (205) extending towards the rear end side formed in the outer periphery of a drilling end section which is the tip side section of a drill body that rotates around an axis, and a cutting edge formed on an intersecting ridgeline section between an inner wall surface facing towards the front in the direction of drill rotation of the chip discharge groove and a tip flank of the drilling end section; wherein, together with a hard coating (211) being applied to the surface of the drilling end section, polishing is performed on the surface of at least a margin section (209) formed on a land section of the drilling end section.