Part-holding device and machine tool provided with said part-holding device

A part-holding device comprising:

• a holding portion configured to hold an object to be held;
• and
• a main body configured to detachably connect to the holding portion;
• wherein the main body includes:
• a first surface;
• a second surface oriented in a direction different to that of the first surface;
• and
• a third surface oriented in a direction different to those of the first surface and the second surface, and the holding portion includes:
• a first abutting surface capable of abutting against the first surface of the main body;
• a second abutting surface capable of abutting against the second surface of the main body;
• a third abutting surface capable of abutting against the third surface of the main body;
• pressing means configured to press the holding portion to cause the first abutting surface to abut against the first surface in a direction parallel to the third surface and to cause the second abutting surface to abut against the second surface;
• and
• fixing means configured to cause the third abutting surface to abut against the third surface and to fix the holding portion to the main body.