Drill

A drill comprising:

• a tip cutting edge provided at a tip end;
• and
• a main cutting edge connected to a rearward end portion of the tip cutting edge,
• wherein:
• a point angle of the tip cutting edge is a predetermined acute angle,
• a point angle of the main cutting edge decreases from a front end toward a rear end of the main cutting edge,
• a point angle at the front end of the main cutting edge is an acute angle greater than the point angle of the tip cutting edge,
• the main cutting edge includes a first part, a second part, and a third part in this order from a tip end side,
• the first part has a constant first point angle,
• the second part has a constant second point angle smaller than the first part, and
• the third part has a third point angle, decreasing continuously toward the rear end thereof, from an angle equal to or smaller than the second point angle.