An electrophotographic toner for negative charging comprises a polyester resin as fixing resin and a quaternary ammonium salt having an oxyacid anion as a charge-controlling assistant in combination with a charge-controlling agent for negative charging and a colorant. The quaternary ammonium salt used as the assistant is incompatible with the fixing resin but dispersible therein. The toner provides a sharp distribution of the charge quantity so that formation of highly charged toner particles which do not contribute to development and of lowly charged toner particles which are easily scattered is effectively prevented.
