Part fastening structure and mounting tool

A part fastening structure that fastens a part using a bolt and a nut,

• wherein the bolt includes:
• a first spiral groove provided on a peripheral surface of the bolt;
• a second spiral groove that is provided on the peripheral surface of the bolt and that is provided on a tip end side of the bolt with respect to the first spiral groove;
• a slit that is provided on the peripheral surface of the bolt along an axial direction, and that extends from a tip end of the bolt to the first spiral groove through the second spiral groove;
• and
• a loosening suppression groove that extends from another end of the second spiral groove to the tip end side,
• wherein the nut includes:
• a first nut member including a first pin that protrudes from an inner peripheral surface toward a central axis side and that is inserted into the first spiral groove;
• a second nut member including a second pin that protrudes from the inner peripheral surface toward the central axis side and that is inserted into the second spiral groove;
• and
• an urging member that is disposed between the first nut member and the second nut member and that urges the first nut member toward a head portion of the bolt.