PURPOSE: To obtain a carrier superior in image characteristics and long in service life, by specifying proportions of the components of ferrite consisting of MgO, MnO, Fe2O3, and ZnO, its electromagnetic characteristics, its particle diameter, and its surface state.

CONSTITUTION: This ferrite consists of 1W40mol% MgO, 0.5W30mol% MnO, 45W 60mol% Fe2O3, and 0.1W30mol% ZnO, and it has 103W1012ohm.cm, 15W80emu/ g saturation magnetization value, ≤10Oe coercive force Hc, ≤10 magnetic permeability μ, ≥50°C Curie temp. Tc, and 5W500 average particle diameter. It is spherical and the surface of each particle is oxidized or coated with a resin. As a result of copying test of this prepared sample of this carrier, 70,000W100,000 sharp copies were obtained as compared with 50,000 copies obtained with usual ferrite carrier in all its service life.