To provide a manufacturing method of an anchor bolt capable of attaining reduction of cost.SOLUTION: In accordance with a manufacturing method of an anchor bolt, multiple abutment parts 12 of an expanded member 8 externally fitted to a taper member 7 of the anchor bolt are molded from a synthetic resin integrally with a bridge part 13. In a core 31 of a metal mold 20 for molding the expanded member 8, a slope 35 for molding an inner surface 11 of each of the abutment parts 12 is formed in an inclined shape closer to an axis of the core 31 as it gets closer to a proximal end side in accordance with the inclination of the inner surface 11 of the abutment part 12. After the expanded member 8 is molded, a movable metal mold 24 and a stationary metal mold 22 are separated, sliders 25a and 25b are moved by sliding and opened and in such a state, the molded expanded member 8 is pushed by an ejector pin 32, such that the expanded member 8 is taken out of the core 31 while spreading the abutment parts 12 outwards along the slope 35 of the core 31.SELECTED DRAWING: Figure 5
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