An ion implantation apparatus comprising an ion source for generating ions, an extraction electrode for extracting ions from the ion source by the action of an extraction electric field, and a mass analysis magnet for deflecting or bending the trajectory of an ion beam extracted by the extraction electrode, the ions that have passed through the mass analysis magnet being implanted into a target,
- wherein the ion implantation apparatus further comprises a first driving mechanism for moving the ion source thereby to change the relative positional relationship between the ion source and the extraction electrode.