PURPOSE: To make it possible that when burning E-shaped and pot-shaped ferrite compacts, their dimensional defects are hardly generated, and the deteriorations of their magnetic characteristics are prevented, and further, their burning costs are reduced.

CONSTITUTION: A ferrite magnetic core compact 20 has the structure wherein an inside leg part 22 and outside leg parts 24 are protruded respectively from a connecting part 26 in an identical direction. The ferrite magnetic core compact 20 is burned, so putting it on an internal insulation that only the end face of the inside leg part 22 is contacted with the surface of the internal insulation. By making the total height of the inside leg part 22 larger than the respective total heights of the outside leg parts 24 (not larger than 5% of the outside dimension of the core compact), the core compact is burned, so putting it on the internal insulation that only the end face of the inside leg part 22 is contacted with the flat surface of the internal insulation. By piling up the core compacts 20 to a plurality of stages in an identical direction, they can be burned too.