Provided is a cutting tool including: a head portion which includes an insert mounting seat on which a cutting insert is installed; a shank which is installed on the rear end side of the head portion and holds the head portion; and a bolt which fixes a position of the head portion with respect to the shank when the head portion is mounted on the shank. The head portion is configured to be mountable to the shank, with the angle thereof changing around a center axis.

Provided is a cutting tool including: a head portion which includes an insert mounting seat on which a cutting insert is installed; a shank which is installed on the rear end side of the head portion and holds the head portion; and a bolt which fixes a position of the head portion with respect to the shank when the head portion is mounted on the shank. The head portion is configured to be mountable to the shank, with the angle thereof changing around a center axis.

A machine tool includes a main spindle that rotates while holding a workpiece, a mover that moves a cutting tool including a linear cutting blade that cuts the workpiece, with respect to the workpiece in a moving direction including at least a Z-direction parallel or substantially parallel with the axis of the main spindle and a Y-direction perpendicular or substantially perpendicular to both the Z-direction and an X-direction determining the amount of cutting of the workpiece, a holder that holds the cutting tool in a state in which the direction of the linear cutting blade is inclined with respect to the Z-direction by a predetermined angle when seen from the X-direction, and an angle adjuster that changes the edge angle.

A machine tool includes a main spindle that rotates while holding a workpiece, a mover that moves a cutting tool including a linear cutting blade that cuts the workpiece, with respect to the workpiece in a moving direction including at least a Z-direction parallel or substantially parallel with the axis of the main spindle and a Y-direction perpendicular or substantially perpendicular to both the Z-direction and an X-direction determining the amount of cutting of the workpiece, a holder that holds the cutting tool in a state in which the direction of the linear cutting blade is inclined with respect to the Z-direction by a predetermined angle when seen from the X-direction, and an angle adjuster that changes the edge angle.