PURPOSE: To obtain high quality images over a long period of time by using a developer contg. a toner contg. uniformly dispersed fine particles of a magnetic body and a carrier in a certain mixing ratio, having satisfactory triboelectric ghargeability, not causing fog or offsetting phenomenon and preventing the scratch of the surface of a photosensitive body.

CONSTITUTION: This two-component magnetic developer consists of a toner, a carrier and additives. The toner contains at least a binding resin, 10-60wt.% fine particles of a magnetic body and a polyolefin polymer. The carrier is resin coated ferrite or steel cores and the additives are inorg. fine particles coated with a nitrogen-contg. compd. and fine particles of a frictional resistance reducing substance.