A binder resin for toner comprising: a polyester resin which contains a constitutional unit derived from isosorbide and has a softening temperature of higher than 120°C; and a polyester resin different from the polyester resin, wherein the binder resin for toner has a pulverizability index of 25 or more, wherein the polyester resin is a polycondensate of a monomer mixture containing either or both of a tri- or higher polycarboxylic acid and a trihydric or higher polyhydric alcohol in a range of from 0.1% to 80% by mole with respect to the total number of moles of entire acid components, wherein the weight average molecular weight (Mw) of the polyester resin is from 500 to 1,000,000 wherein the softening temperature is determined by conducting a measurement by using 1.0 g of a measurement sample at a load of 294 N while constantly increasing the temperature at a rate of temperature increase of 3°C/min by using a nozzle of 1 mm φ × 10 mm and a flow tester and determining the temperature at which the measurement sample is discharged by 4 mm from the baseline as the softening temperature, and wherein the pulverizability index is determined by a method disclosed in the description. a polyester resin which contains a constitutional unit derived from isosorbide and has a softening temperature of higher than 120°C; and a polyester resin different from the polyester resin, wherein the binder resin for toner has a pulverizability index of 25 or more, wherein the polyester resin is a polycondensate of a monomer mixture containing either or both of a tri- or higher polycarboxylic acid and a trihydric or higher polyhydric alcohol in a range of from 0.1% to 80% by mole with respect to the total number of moles of entire acid components, wherein the weight average molecular weight (Mw) of the polyester resin is from 500 to 1,000,000 wherein the softening temperature is determined by conducting a measurement by using 1.0 g of a measurement sample at a load of 294 N while constantly increasing the temperature at a rate of temperature increase of 3°C/min by using a nozzle of 1 mm φ × 10 mm and a flow tester and determining the temperature at which the measurement sample is discharged by 4 mm from the baseline as the softening temperature, and wherein the pulverizability index is determined by a method disclosed in the description. wherein the polyester resin is a polycondensate of a monomer mixture containing either or both of a tri- or higher polycarboxylic acid and a trihydric or higher polyhydric alcohol in a range of from 0.1% to 80% by mole with respect to the total number of moles of entire acid components, wherein the weight average molecular weight (Mw) of the polyester resin is from 500 to 1,000,000 wherein the softening temperature is determined by conducting a measurement by using 1.0 g of a measurement sample at a load of 294 N while constantly increasing the temperature at a rate of temperature increase of 3°C/min by using a nozzle of 1 mm φ × 10 mm and a flow tester and determining the temperature at which the measurement sample is discharged by 4 mm from the baseline as the softening temperature, and wherein the pulverizability index is determined by a method disclosed in the description.