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 of the guide portion is smaller than a minor diameter of the internal thread corresponding to the bolt and larger than a diameter 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 of the guide portion is smaller than a minor diameter of the internal thread corresponding to the bolt and larger than a diameter 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°.