Cutting tool

A cutting tool comprising:

• a holder having a first surface and a second surface provided to be separated from each other to sandwich an axis line;
• a head including a cutting edge portion located between the first surface and the second surface, and a shank portion configured to hold the cutting edge portion;
• and
• a fastening portion configured to fix the head to the holder,
• the holder being provided with a first hole and a second hole, the first hole extending in a first direction and a third direction, the first direction being inclined by a first angle toward the cutting edge portion relative to a direction perpendicular to the axis line, the third direction being inclined by a second angle relative to a second direction extending from the second surface toward the first surface when viewed in a direction parallel to the axis line, the second hole communicating with the first hole, the second hole extending in the direction parallel to the axis line,
• the shank portion having a flat surface portion, the shank portion being provided inside the second hole,
• the fastening portion being provided inside the first hole, the fastening portion being in contact with the flat surface portion,
• in a plane perpendicular to the axis line, a third angle between the second direction and a fourth direction perpendicular to the flat surface portion being larger than the second angle,
• the third angle being less than 90°, and
• a contact surface of the fastening portion is inclined with respect to the flat surface portion when viewed in a cross-sectional surface perpendicular to the axis line.