Drill

A drill including a drill main body to be rotated around a shaft center, and a discharge flute provided in a helical shape along an outer peripheral surface of the drill main body from a leading end portion toward a rear end portion thereof, a cutting edge being provided that is formed at a ridge section between an inner face, of the discharge flute, oriented toward a rotation direction side of the drill main body and a flank of the drill main body at the leading end portion, the drill comprising:

• a thinning edge provided at the leading end portion of the drill main body and extending from an inner end of the cutting edge toward a central portion side of the leading end portion of the drill main body;
• a gash portion, a ridge line between the gash portion and the flank extending in a circular arc shape from an inner end of the thinning edge toward the outer peripheral surface of the drill main body;
• a coolant passage provided inside the drill main body and extending from the rear end portion toward the leading end portion of the drill main body;
• and
• an oil hole provided only at a gash face of the gash portion, the oil hole being an outlet of the coolant passage.