Stud bolt

A stud bolt to be fixed, in a retained state and a rotation stop state, to a mounting target plate, the stud bolt comprising:

• a head;
• a screw shaft portion extending from a bearing surface of the head;
• a rotation stop portion that is formed in a non-perfect circular shape surrounding the screw shaft portion as viewed in a screw advance direction of the screw shaft portion, and that bulges toward a downstream side in the screw advance direction from the bearing surface;
• an annular groove of the screw shaft portion that is recessed in an annular shape toward an inner side in a radial direction of the screw shaft portion, at a position adjacent to the rotation stop portion on the downstream side in the screw advance direction;
• and
• an annular protrusion of the screw shaft portion that protrudes in an annular shape toward an outer side in the radial direction of the screw shaft portion, at a position adjacent to the annular groove on the downstream side in the screw advance direction, wherein
• the mounting target plate is to be sandwiched between the bearing surface and the annular protrusion,
• a recessed portion recessed toward an upstream side in the screw advance direction and having the same non-perfect circular shape as the rotation stop portion is formed in the rotation stop portion,
• the recessed portion includes an inclined portion inclined so as to be closer to the head as the inclined portion goes from the outer side in the radial direction toward the inner side in the radial direction, and a linear portion parallel to the bearing surface, and
• a most protruding end of the inclined portion is for linearly biting into the mounting target plate throughout an entire circumference of the most protruding end.