A toner containing at least a binder resin and a colorant, wherein the toner has a core-shell structure composed of a core, and a shell having a thickness of 0.01 μm to 2 μm on a surface of the core, and wherein the toner satisfies the following relation: 1.1≦ST/CT≦2.0 where ST is a softening temperature of the shell, and CT is a softening temperature of the core, both measured by a SPM probe with an integrated heater.