Drill

A drill that rotates around a central axis, comprising:

• a rake face that includes a first rake face portion and a second rake face portion;
• a flank face contiguous to the rake face;
• and
• a thinning face contiguous to each of the rake face and the flank face, wherein
• a ridgeline between the rake face and the flank face includes an outer cutting edge,
• a ridgeline between the thinning face and the flank face includes a first thinning portion contiguous to the outer cutting edge, and a second thinning portion contiguous to the first thinning portion,
• when viewed in a direction along the central axis, the first thinning portion is linear and the second thinning portion is curved,
• when viewed in the direction along the central axis, the first thinning portion, and a boundary between the first thinning portion and the second thinning portion are located rearward in a rotational direction relative to a first straight line, and are located forward in the rotational direction relative to a second straight line, the first straight line being a straight line passing through the central axis and parallel to the first thinning portion, and the second straight line being a straight line perpendicular to the first straight line,
• when viewed in the direction along the central axis, the second thinning portion has a radius of curvature which is more than or equal to 5% and less than or equal to 30% of twice a distance between an outer end portion of the outer cutting edge and the central axis, and
• when viewed in the direction along the central axis, a distance between the first thinning portion and the first straight line is more than or equal to 0.001 mm and less than or equal to 1.0 mm, and
• wherein the first rake face portion is contiguous to the second rake face portion,
• wherein in a radial direction, the first rake portion is located on the central axis side relative to the second rake face portion,
• wherein the second rake face portion is tiled rearward in the rotational direction relative to the first rake face portion,
• wherein a maximum length of the second rake face portion in the direction along the central axis is greater than a maximum length of the second rake face portion in the radial direction, and
• wherein when viewed in the direction along the central axis, the second thinning portion intersects each of the first straight line and the second straight line.