Body for gun drill

A body for a gun drill, the body comprising:

• a first attachment part serving as a portion that is provided on a leading end side of the body and has a cutting edge mounted thereon;
• and
• a second attachment part serving as a portion that is provided at a position different from a position of the first attachment part along a circumferential direction and has a guide pad attached thereto on the leading end side, wherein
• one discharging groove that extends from the leading end side to a base end side of the body and is used to guide and discharge a fluid to the base end side is formed on an outer peripheral surface of the body,
• the discharging groove has a helix-shaped bent part between the leading end side and the base end side, a first linear part extending linearly from the leading end side to the bent part, and a second linear part extending linearly from the bent part to the base end side,
• the bent part is oriented in a direction that curves opposite to a rotating direction gradually toward the base end side from the leading end side,
• when viewed along a rotational center axis, an angle between an inner surface of the first linear part and an inner surface of the second linear part defines a torsion angle, the torsion angle being a change amount of an angle of an inner surface of the discharging groove, with a position of the discharging groove being changed from the leading end side to the base end side, and
• the torsion angle is 40 degrees or less.