Drill

A drill comprising:

• a drill main body to be rotated around a shaft center;
• a plurality of discharge flutes provided in a helical shape in an outer peripheral surface from a leading end portion toward a rear end portion of the drill main body;
• a cutting edge 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;
• 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 chisel, the chisel being a leading end section of the drill main body;
• a thinning face being a rake face of the thinning edge, and connecting the thinning edge with the discharge flute;
• and
• a gash portion connected to the thinning face, a ridge line between the gash portion and the flank extending in a circular arc shape from an inner end of the thinning edge, and being connected to the discharge flute, wherein
• the gash portion is connected to the discharge flute while twisting along a helix angle of the discharge flute,
• when viewing the drill main body from the side view, a boundary between the outer peripheral surface and the gash portion extends from the leading end portion side toward the rear end portion side of the main body, bulges in an arc-shape toward the outer peripheral surface side at the leading end portion side, and bulges in an arc-shape toward the gash portion side at the rear end portion side.