Disclosed is a pedicle screw. By changing the structure of a threaded portion of a locking bolt engaged with a head of the pedicle screw and forming a groove on the locking bolt, the threaded portion is pressed in a fastening direction of the locking bolt, so that when a head of the pedicle screw is fastened to the locking bolt, a fixation cap is not released by the force applied from the head expanding towards an outside, and thus the locking bolt is easily fastened to the head of a screw body, thereby improving an inefficiency factor such as delay of surgical operation time due to release or interference of the fixation cap.
