PURPOSE: An anchor bolt is provided to compress a bolt rod and a wall and integrally fix the bolt rod to the wall by more expanding a wedge pipe as the thickness of a protrusion than an existing wedge pipe. CONSTITUTION: An anchor bolt (100) comprises a bolt rod (200), a wedge pipe (300), and a nut (400). The bolt rod is supported by being inserted into an anchor hole formed on a wall (110) of a building. The wedge pipe is mounted on an expansion unit (210) of the bolt rod and fixes the bolt rod inserted into the anchor hole. The wedge pipe includes a plurality of expansion pieces (320) formed on a cut hole (311) and a protrusion (330) attached to the inner surface of the expansion pieces. The nut is mounted on a thread (212) of the bolt rod and expands the wedge pipe to the front.
