Guide pad and gun drill having guide pad

A gun drill having a guide pad, the guide pad comprising:

• a first surface that is a surface located on an outer peripheral side of the gun drill;
• a second surface that is a flat surface located at a position opposed to the first surface and is supported from an inside by a body of the gun drill;
• and
• a third surface that is, among surfaces connecting the first surface and the second surface to each other, a surface extending along a rotational center axis of the body and abutting on a part of the body, wherein
• a through hole used to insert and fasten a fastening member to the body is formed so as to penetrate the guide pad from the first surface to the second surface, and
• when viewed along the rotational center axis of the body,
• the first surface is a circular-arc-shaped surface,
• a first point is a point at which a virtual line passing through a circular-arc center of the first surface and a plane defined by the second surface intersect perpendicularly;
• a second point is a point at which a central axis of the through hole and the plane defined by the second surface cross each other, and
• the first point is located at a position closer to the third surface than the second point,
• the body has, on an outer peripheral side thereof, a groove used to guide a fluid toward a leading end side, and
• the groove is formed so as to extend along an entire outer shape of the guide pad.