A toner comprising: a pigment; polyester resin A that is insoluble in tetrahydrofuran; and polyester resin B that is soluble in THF, wherein the toner satisfies requirements to below: the polyester resin A includes one or more aliphatic diols including from 3 through 10 carbon atoms, as a component constituting the polyester resin A; the polyester resin B includes at least an alkylene glycol in an amount of 40 mol% or more, as a component constituting the polyester resin B; and a glass transition temperature (Tglst) of the toner at first heating in differential scanning calorimetry of the toner is from 20°C through 50°C; wherein the polyester resin A comprises a trivalent or tetravalent aliphatic alcohol, as a cross-linking component constituting the polyester resin A; and wherein the polyester resin A includes at least one of a urethane bond and a urea bond; wherein the glass transition temperature (Tglst) is measured by placing an aluminium sample container charged with about 5.0 mg of the sample of interest on a holder unit, setting the holder unit in an electric furnace, heating the sample from -80°C to 150°C at a heating rate of 10°C/min under a nitrogen atmosphere (first heating), cooling the sample from 150°C to -80°C at a cooling rate of 10°C/min, heating again to 150°C at a heating rate of 10°C/min (second heating), generating DSC curves for the first heating and the second heating by means of a differential scanning calorimeter, selecting a DSC curve for the first heating from the resultant DSC curves by means of an analysis program, and determining the glass transition temperature at the first heating of the sample of interest. a pigment; polyester resin A that is insoluble in tetrahydrofuran; and polyester resin B that is soluble in THF, wherein the toner satisfies requirements to below: the polyester resin A includes one or more aliphatic diols including from 3 through 10 carbon atoms, as a component constituting the polyester resin A; the polyester resin B includes at least an alkylene glycol in an amount of 40 mol% or more, as a component constituting the polyester resin B; and a glass transition temperature (Tglst) of the toner at first heating in differential scanning calorimetry of the toner is from 20°C through 50°C; wherein the polyester resin A comprises a trivalent or tetravalent aliphatic alcohol, as a cross-linking component constituting the polyester resin A; and wherein the polyester resin A includes at least one of a urethane bond and a urea bond; wherein the glass transition temperature (Tglst) is measured by placing an aluminium sample container charged with about 5.0 mg of the sample of interest on a holder unit, setting the holder unit in an electric furnace, heating the sample from -80°C to 150°C at a heating rate of 10°C/min under a nitrogen atmosphere (first heating), cooling the sample from 150°C to -80°C at a cooling rate of 10°C/min, heating again to 150°C at a heating rate of 10°C/min (second heating), generating DSC curves for the first heating and the second heating by means of a differential scanning calorimeter, selecting a DSC curve for the first heating from the resultant DSC curves by means of an analysis program, and determining the glass transition temperature at the first heating of the sample of interest. the polyester resin A includes one or more aliphatic diols including from 3 through 10 carbon atoms, as a component constituting the polyester resin A; the polyester resin B includes at least an alkylene glycol in an amount of 40 mol% or more, as a component constituting the polyester resin B; and a glass transition temperature (Tglst) of the toner at first heating in differential scanning calorimetry of the toner is from 20°C through 50°C; wherein the polyester resin A comprises a trivalent or tetravalent aliphatic alcohol, as a cross-linking component constituting the polyester resin A; and wherein the polyester resin A includes at least one of a urethane bond and a urea bond;