A bolt comprising a tapered surface , a guide portion , and a threaded portion in order from a distal end side, the bolt further comprises a plurality of cutout portions provided at a distal end portion of the threaded portion , characterized in that the bolt further comprises a plurality of recesses provided on the tapered surface , the guide portion is formed between a groove portion , which exists on the extension of the same helix as a thread root of the threaded portion and is formed at a distal end portion of the threaded portion so that a depth in a radial direction is deeper than the thread root , and a surface end position on a base end side of the tapered surface , the guide portion has a shape extending in a direction around an axis (Ax) of the bolt from a starting end portion to a terminal end portion and expanding in an axial direction of the bolt in transition from the starting end portion to the terminal end portion , the starting end portion being an intersection between the surface end position on the base end side of the tapered surface and a helix according to the groove portion , a diameter (d2) of the guide portion is smaller than a minor diameter of the internal thread corresponding to the bolt and larger than a diameter (d4) of the thread root of the bolt , the guide portion and the threaded portion are continuously formed such that the distal end portion of the threaded portion overlaps with the terminal end portion of the guide portion , and in a region of the guide portion , an angle (θ3) in the direction around the axis (Ax) of the bolt between the starting end portion and the terminal end portion is in the range of 90° to 360°. the bolt further comprises a plurality of cutout portions provided at a distal end portion of the threaded portion , characterized in that the bolt further comprises a plurality of recesses provided on the tapered surface , the guide portion is formed between a groove portion , which exists on the extension of the same helix as a thread root of the threaded portion and is formed at a distal end portion of the threaded portion so that a depth in a radial direction is deeper than the thread root , and a surface end position on a base end side of the tapered surface , the guide portion has a shape extending in a direction around an axis (Ax) of the bolt from a starting end portion to a terminal end portion and expanding in an axial direction of the bolt in transition from the starting end portion to the terminal end portion , the starting end portion being an intersection between the surface end position on the base end side of the tapered surface and a helix according to the groove portion , a diameter (d2) of the guide portion is smaller than a minor diameter of the internal thread corresponding to the bolt and larger than a diameter (d4) of the thread root of the bolt , the guide portion and the threaded portion are continuously formed such that the distal end portion of the threaded portion overlaps with the terminal end portion of the guide portion , and in a region of the guide portion , an angle (θ3) in the direction around the axis (Ax) of the bolt between the starting end portion and the terminal end portion is in the range of 90° to 360°. <EOS>