A component mounting machine, includes a mounting base provided in a component mounting machine main body and movable at least in the horizontal direction; a mounting/demounting tool, detachably mounted on the mounting base and movable in the up-down direction while holding a component; a tool moving mechanism configured to move the mounting/demounting tool in the up-down direction; a mounting base moving mechanism configured to move the mounting base at least in the horizontal direction; and a control device configured to perform a seating improvement process for applying a force in a predetermined direction, including the horizontal direction, to the mounting base on which the mounting/demounting tool is mounted after the mounting/demounting tool is mounted on the mounting base and before the mounting/demounting tool holds the component, by a moving operation different from a moving operation for holding the component on the mounting/demounting tool in the mounting base moving mechanism.