A liquid developer which includes an insulating liquid, and toner fine particles
containing a coloring agent and a toner resin. In the liquid developer, its electric
capacitance does not significantly vary in an electric circuit where an electrical
double-layer capacitor and an electronic resistance corresponding to a velocity
of an electron exchange during an electrode reaction are connected in parallel,
and a resistance corresponding to an electric conductivity of the insulating liquid
is connected in series. The coloring agent has a coating layer so as to maintain
distances between the toner fine particles. The insulating liquid has a viscosity
of 0.5 mPas to 1000 mPas, a specific resistance of 11012
cm or more, and a surface tension of 30 dyn/cm or less, and may be
a nonvolatile liquid having a boiling point of 100 C. or higher.
