Polymerized toner and production process thereof

A polymerized toner of a core-shell structure, comprising colored polymer particles which contain a colorant, and a polymer layer which covers each of the colored polymer particles, wherein the polymerized toner has the following features:(a) the gel content being 60 to 95% as measured by an extraction method with tetrahydrofuran;(b) the melt index being 0.5 to 15 g/10 min as measured at 150° C. and under a load of 2.16 kg; and(c) the spheroidicity represented by an average value of a ratio (rl/rs) of a length (rl) to a breadth (rs) being 1.0 to 1.2,and a production process thereof.