It is an object of the present invention to make it possible to install an anchor bolt while securing the pull-out strength of the anchor bolt even when the anchor bolt installation position encounters a reinforcement in concrete. An anchor bolt according to the present invention includes a first anchor bolt 2 having an embedded portion shorter than a reinforcement covering margin, a second anchor bolt 7 having an axis at a position deflected from an axis of the first anchor bolt 2, and a coupling member 5 integrally fixing the first anchor bolt 2 and the second anchor bolt 7. Further, in an installing method of an anchor bolt according to the present invention, when a first anchor hole bored at the anchor bolt installation position encounters a reinforcement, a second anchor hole is bored at a position in a direction other than the arrangement direction of the encountered reinforcement, to thereby install the anchor bolt according to the present invention.