To correctly manufacture a side force bolt in particular excellent in strength extremely at a low cost.

When a side force bolt 10 is manufactured, a rod-shaped core 1 made of conventional structural steel is pulled into a sleeve pipe 2 formed of a stainless steel rod-shaped pipe. In this process, the external dimensions are regulated simultaneously with the pull-in. A rod-shaped semi-product 3 is cut by a saw 30 to form a rod 4. The core is extruded by a hydraulic press from the rod 4 by the prescribed length (a), and a projected part 5 is cut. Then, the core 1 is returned by the half value a/2 of the length of the removed part 5, and the sleeve pipe 2 is closed in the final stage.