PURPOSE: To obtain the inexpensive ferrite magnetic core having high bonding strength and low reduction in magnetic characteristics by bonding on the sintered fitting surfaces thereof.

CONSTITUTION: This ferrite magnetic core consists of a core 1 made of cylindrical ferrite, and an annular ferrite magnetic core 3 formed with a hole 2 at the center in such a manner that the diameter of the core 1 is slightly smaller than the diameter of the hole 2 in size and the core 1 is inserted into the hole 2 is a direction as designated by arrows A. The engaging dimensions of both the cores 1 and 2 are determined by considering their contraction ratios so that the sintered fitting surfaces 14 thereof are tightly engaged in the state that after the shrinkage fitting the sintered annular ferrite core 10 is fitted to the sintered ferrite core 8. In this manner, there can be provided the ferrite magnetic core which has excellent magnetic properties and complicated configuration with dense bonding surfaces in such a manner as easy combination of different compositions and materials.