Abstract: The arrangement for mounting a sparkplug of an internal combustion engine includes mounting the sparkplug so that all of the outside electrodes are arranged at an intake port side area and/or an exhaust port side area. Alternatively, in the case where at least one of the outside electrodes is located outside of the above-mentioned areas, no other remaining outside electrodes are arranged at a position that faces that outside electrode across the central electrode.

Abstract: The arrangement for mounting a sparkplug of an internal combustion engine in accordance with the present claimed invention is that the sparkplug is mounted so that all of the outside electrodes are arranged in areas of a side of an intake port opening and/or a side of an exhaust port opening limited by the sparkplug and the intake port opening and by the sparkplug and the exhaust port opening or in case at least one of the outside electrodes locates outside of the above-mentioned limited area, other remaining outside electrodes are arranged at positions to avoid facing the outside electrode locating outside of the limited area across the central electrode.