A bead core for pneumatic tires comprised of a ring-like bead core main body 11 in which a single bead wire 10 is wound in a multi-seriate and multi-staged manner and provided with angular portions P on an outer peripheral surface S in a meridian section thereof, and staple fittings 12 in which a meridian section is warped in a C-shaped manner for preventing loosening of the bead wire 10 by surrounding the outer peripheral surface S. The staple fittings 12 comprise concave portions 14 for restricting positional shift of the staple fittings around the bead core main body 11 with the angular portions P entering the same. With this arrangement, it is possible to restrict positional shift of the staple fittings around the bead core and to effectively restrict damages of inner liner rubber owing to the positional shift.