Tool holder for lathe and lathe provided with the tool holder

A lathe, comprising:

• a spindle;
• a turret;
• a Z-axis feed mechanism moving the spindle and the turret relative to each other in a direction of a Z-axis extending along a center axis of the spindle;
• an X-axis feed mechanism moving the spindle and the turret relative to each other in a direction of an X-axis orthogonal to the Z-axis;
• a Y′-axis feed mechanism moving the spindle and the turret relative to each other in a direction of a Y′-axis orthogonal to the Z-axis and intersecting with the X-axis non-perpendicularly;
• and
• a plurality of tool holders each having a tool holding part holding a tool, and attached to the turret,
• the lathe being configured to move the spindle and the turret in a direction of a Y-axis orthogonal to both the X-axis and the Z-axis by combined operation of the X-axis feed mechanism and Y′-axis feed mechanism,
• at least one of the plurality of tool holders having a single tool holding part holding the tool, the single tool holding part holding the tool at a holding position thereon set at a position such that, when the held tool is indexed to the machining position by rotation of the turret, a cutting-edge reference point of the held tool is offset to a side opposite to the X-axis feed mechanism and the Y′-axis feed mechanism with respect to a plane which includes the center axis of the spindle and a center axis of the turret and is parallel to the X-axis and the Z-axis.