A staking bolt that is caulked and fixed to a metal plate, and an object to be fastened is fastened by a nut to the staking bolt, the staking bolt comprising: a head; and a shank having an external thread, wherein a ring-shaped protrusion at an upper end of the shank and a ring groove located closer to the head relative to the ring-shaped protrusion are formed, wherein the head is flat and on a bearing face of the head, a whirl-stop protrusion having a plurality of radially extending arms protrudes with a thickness of t from the bearing face of the head, wherein a minimum diameter D between respective arms of the whirl-stop protrusion is larger than an outer diameter d of the ring-shaped protrusion, and wherein t × (D - d)/2 which is a longitudinal cross-sectional area A of a minimum diameter portion of the whirl-stop protrusion is equal to or greater than a longitudinal cross-sectional area of the ring groove, wherein an outer diameter d1 of the shank at a portion between the ring-shaped protrusion and the external thread is less than a root diameter d2 of the external thread, and wherein an inner diameter of the nut, which is the inner diameter of the internal thread of the nut, is approximately equal to the root diameter of the external thread formed on the shank, characterized in that the outer diameter of the shank at the portion between the ring-shaped protrusion and the external thread, the root diameter of the external thread and the inner diameter of the internal thread of the nut cooperate so that the nut is screwed in sufficiently deeply over the portion of the shank between the ring-shaped protrusion and the external thread to provide secure fastening between the nut and the object fastened. a head; and a shank having an external thread, wherein a ring-shaped protrusion at an upper end of the shank and a ring groove located closer to the head relative to the ring-shaped protrusion are formed, wherein the head is flat and on a bearing face of the head, a whirl-stop protrusion having a plurality of radially extending arms protrudes with a thickness of t from the bearing face of the head, wherein a minimum diameter D between respective arms of the whirl-stop protrusion is larger than an outer diameter d of the ring-shaped protrusion, and wherein t × (D - d)/2 which is a longitudinal cross-sectional area A of a minimum diameter portion of the whirl-stop protrusion is equal to or greater than a longitudinal cross-sectional area of the ring groove, wherein an outer diameter d1 of the shank at a portion between the ring-shaped protrusion and the external thread is less than a root diameter d2 of the external thread, and wherein an inner diameter of the nut, which is the inner diameter of the internal thread of the nut, is approximately equal to the root diameter of the external thread formed on the shank, characterized in that the outer diameter of the shank at the portion between the ring-shaped protrusion and the external thread, the root diameter of the external thread and the inner diameter of the internal thread of the nut cooperate so that the nut is screwed in sufficiently deeply over the portion of the shank between the ring-shaped protrusion and the external thread to provide secure fastening between the nut and the object fastened.