Abstract: The toner for developing an electrostatic latent images of the present invention, comprising colored resin particles containing at least a binder resin and a colorant wherein said colored resin particles have a volume average particle diameter (Dv) in the range from 4 to 10 ?m and an average circularity in the range from 0.930 to 0.995 and, a zeta potential (E1) of the toner after laid still under a condition at a temperature of 23° C. and a humidity of 50% for one day and night is in the range from ?50 to ?10 mV and a difference is less than 5 mV between a zeta potential (E2) of the toner after laid still under an environment of temperature of 50° C. and humidity of 80% for two weeks and El. According to the present invention, there are provided toners for developing electrostatic images, which forms images without losing quality due to environmental changes and also has excellent storage stability and flowability.