To provide an anchor bolt which eases an impact caused by large vibrations.

A sill fixing structure fixes a sill 21 to a foundation 28 by means of the anchor bolt 1 formed of a screw portion 6 having a screw 7 on one end thereof, a spring portion 10 formed at a raw workpiece portion extending to the screw portion 6, and a fixing portion 13 extending to the screw portion 10 and fixed to the foundation 28. The sill 21 has a hole 22 into which the spring portion 10 of the anchor bolt 1 is inserted. Then the fixing portion 13 of the anchor bolt is embedded in and fixed to the foundation 28, and the sill 21 is mounted on the foundation 28, to thereby allow the spring portion 10 of the anchor bolt to be located in the hole 22. Further a nut 16 is screwed onto the screw portion 6 of the anchor bolt via a seat member 18, and in this manner the sill 21 is fixed to the foundation 28.