PURPOSE: To extend a life of a ferrite carrier by forming a film of a specified thickness made of a fluororesin or epoxy resin high in electrical resistance and humidity resistance on the surface of a hexagonal Ba-Zn ferrite carrier partially substd. by a mono- or higher-valent metal having a specified particle diameter.

CONSTITUTION: An electrostatic developing ferrite carrier is obtained by forming a 0.01W30μm thick film made of a fluororesin or epoxy resin having high electrical resistance and humidity resistance on the surface of a Ba-Zn ferrite having 10W1,000μm particle diameter. Triboelectrification of the magnetic carrier can be controlled by forming a single layer of the fluororesin alone or double layer films of the thin fluororesin stuck first and further the epoxy resin to optionally change electrical properties. Said film forms a tough film on the surface of the ferrite carrier composed essentially of hexagonal Ba-Zn and stripping of the film from the carrier during development and subsequent staining due to adhesion of the toner to the resin occur scarcely, and therefore, the obtained magnetic carrier is extended in life.