Auger bit

An auger bit mounted on an auger head, the auger bit comprising:

• a base part having a leading end protruding in an axial direction of the auger head;
• and
• two leg parts continuously extending from the base part and facing each other at a predetermined interval, wherein
• the base part includes a plane part parallel to and continuous with planes of the leg parts, a first tilted part that is tilted from the plane part toward a side closer to the leading end in the axial direction of the auger head, a second tilted part and a third tilted part that are continuous with the first tilted part, a first side surface part continuous with the second tilted part, a second side surface part continuous with the third tilted part, and a fourth tilted part that is tilted from the first and third tilted parts toward a side closer to the leg parts in the axial direction of the auger head, a first superhard chip is disposed across parts of the first side surface part and the fourth tilted part at a lower end part where the second tilted part is continuous with the first side surface part and the fourth tilted part,
• a second superhard chip is disposed across a part of the fourth tilted part at a lower substantially central part of the second tilted part, and a third superhard chip is disposed across the first and third tilted parts, the second side surface part, and the fourth tilted part at a lower end part where the first and third tilted parts are continuous with each other and the fourth tilted part, and
• the plane part and the leg parts each have a shape curved at a predetermined curvature relative to the axial direction of the auger head.