A method for forming a toner image

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PROBLEM TO BE SOLVED : To provide the toner superior in developability and stabilized in image density even in various environments of high and low temperatures and humidities and small in fog. SOLUTION : This toner contains the toner particles composed of a binder resin and a colorant and a fine inorganic powder A and the fine inorganic powder A contains a rate earth element compound containing oxide of rare earth element in an amount of 88.0-97.0, mass %, and this rare earth element compound contains Ce in an amount of 40.0-65.0 mass % as CeO2 and La in an amount of 25.0-45.0 mass % as La2O3, Nd in an amount of 1.0-10.0 mass % as Nd2O3, and Pr in an amount of 1.0-10.0 mass % as Pr6O11, and it contains further, rare earth element fluoride and the fine inorganic powder A contains an F element in an amount of 2.0-11.0 mass %.