Abstract: A bolt for joining a first component and a second component, the bolt being capable of correcting a position of the second component with respect to the first component is provided. A bolt is fitted in a first hole of a first component and in a second hole of a second component in order to join the first component and the second component. The bolt includes a flange part, a threaded part, a head part, and a centering part. The centering part has a centering part body, and a plurality of blades. Each blade has an external-diameter increase portion in which a distance from the axis to an outer edge gradually increases toward a direction opposite to a tightening rotation direction of the bolt, and a distance from the axis to the outer edge gradually increases along an axial direction toward the flange part.