A production process of a polymerized toner composed of polymer particles, including a step of polymerizing a polymerizable monomer composition containing a colorant and a polymerizable monomer in the presence of a polymerization initiator in an aqueous dispersion medium, wherein, in a stripping treatment step, the dispersion containing the polymer particles is introduced into an evaporator to conduct the stripping treatment by a method, in which a gas is blown into the dispersion within the evaporator to discharge volatile organic components including an unreacted polymerizable monomer out of the evaporator concomitantly with the gas, and both inert gas and saturated steam are used as the gas blown into the dispersion.