Electron bunching in the multipacting mechanism of low‐pressure high‐frequency discharge, also known as the secondary electron resonance mechanism, is analyzed by an extension of simple multipacting theory. The bunching range is assumed to be that range in the electrical phase angle &phgr; within which secondary electrons emitted from one electrode can successfully traverse the interelectrode gap in ½ cycle and arrive at the opposite electrode with energy equal to or greater than emission energy. At the lower voltage limit of multipacting, the ½‐cycle bunching range is shown to be −90° ≤ &phgr; ≤ +90°; at the upper voltage limit, the range is narrowed to −90° ≤ &phgr; ≤ −40°. Typical examples of multipacting bunching, including higher‐order modes, are illustrated with graphical trajectories. The effects of secondary emission characteristics on bunching are also discussed.