A stylus and an electronic device component are disclosed. The stylus includes a stylus rod and a detachable stylus tip at one end of the stylus rod, and further includes a first electrode, a second electrode, and a circuit board. The first electrode is disposed in the stylus tip. The second electrode is disposed on an inner wall of the stylus rod, or the second electrode is disposed on a fastener in the stylus rod, and the second electrode is electrically connected to the second circuit board. This increases a distance between the first electrode and the second electrode, and reduces coupling between the first electrode and the second electrode. The stylus in embodiments of this application resolves a problem that writing accuracy of the stylus is reduced because the two electrodes in the stylus are easily coupled.