Broach

A broach comprising:

• a broach body having a shaft shape;
• and
• a cutting edge section formed on an outer circumference of the broach body, the cutting edge section having a plurality of cutting edges that protrude from the outer circumference of the broach body and are arranged in a longitudinal direction of the broach body;
• wherein the cutting edge section includes, in order from a front side in the longitudinal direction of the broach body:
• a circumference cutting section in which an outer diameter of each of the cutting edges of the circumference cutting section sequentially increases toward a rear side of the broach body, and
• a tooth thickness cutting section in which a thickness of each of the cutting edges in a circumferential direction of the broach body sequentially increases from the cutting edge section at a rear end of the circumference cutting section toward the rear side of the broach body,
• a high-feed cutting section, in which an outer diameter of each of the cutting edges of the high-feed cutting section sequentially increases toward the rear side of the broach body, is disposed in at least a rear end portion of the circumference cutting section, and
• a cutting depth per cutting edge in the high-feed cutting section is set in a range of 0.15 mm to 0.30 mm.