A toner binder comprising a polyester resin, wherein the toner binder satisfies Formula and Formula given below and has a content of a surfactant of 100 ppm or less, G ′ x 150 ≥ 10,000 G ′ x 150 / G ′ y 150 ≥ 500 wherein G' x150 represents the storage modulus (unit: Pa) at 150°C for the tetrahydrofuran (THF) -insoluble component of the toner binder and G' y150 represents the storage modulus (unit: Pa) at 150°C of the THF-soluble component of the toner binder, wherein the toner binder satisfies Formula and Formula given below: G " x 150 / G ′ x 150 ≥ 0.1 G " y 120 / G ′ y 120 ≤ 20 wherein G" x150 represents the loss modulus (unit: Pa) at 150°C for the THF-insoluble component of the toner binder, G" y120 represents the loss modulus (unit: Pa) at 120°C of the THF-soluble component of the toner binder, G' x150 represents the storage modulus (unit: Pa) at 150°C for the THF-insoluble component of the toner binder, and G' y120 represents the storage modulus (unit: Pa) at 120°C of the THF-soluble component of the toner binder, wherein the THF-insoluble component and the THF-soluble component are obtained in accordance with the description, and the storage moduli G' x150 , G' y150 , G" x150 , G' y120 , and G" y120 are determined in accordance with the description, wherein the polyester resin comprises a non-linear polyester resin (A) and a linear polyester resin (B), wherein the non-linear polyester resin (A) is (i) a modified non-linear polyester resin (A1) produced by reacting a polyester resin (a1) having an active hydrogen on a terminal of the main chain with an extender (D), (ii) a modified non-linear polyester resin (A2) prepared by chemically bonding a polyester resin (a2) prepared from an alcohol component (y) and an unsaturated carboxylic acid component (z) or (iii) a modified non-linear polyester resin (A3) prepared by chemically bonding a polyester resin (a2) prepared from an alcohol component (y) and an unsaturated carboxylic acid component (z), with a compound (b) having a radical reactive group and having a number average molecular weight of 1,000 or less by a crosslinking reaction in which carbon-carbon bonds are formed by a radical addition reaction between the compound (b) having a radical reactive group and the polyester resin (a2). wherein G' x150 represents the storage modulus (unit: Pa) at 150°C for the tetrahydrofuran (THF) -insoluble component of the toner binder and G' y150 represents the storage modulus (unit: Pa) at 150°C of the THF-soluble component of the toner binder, wherein the toner binder satisfies Formula and Formula given below: G " x 150 / G ′ x 150 ≥ 0.1 G " y 120 / G ′ y 120 ≤ 20 wherein G" x150 represents the loss modulus (unit: Pa) at 150°C for the THF-insoluble component of the toner binder, G" y120 represents the loss modulus (unit: Pa) at 120°C of the THF-soluble component of the toner binder, G' x150 represents the storage modulus (unit: Pa) at 150°C for the THF-insoluble component of the toner binder, and G' y120 represents the storage modulus (unit: Pa) at 120°C of the THF-soluble component of the toner binder, wherein the THF-insoluble component and the THF-soluble component are obtained in accordance with the description, and the storage moduli G' x150 , G' y150 , G" x150 , G' y120 , and G" y120 are determined in accordance with the description, wherein the polyester resin comprises a non-linear polyester resin (A) and a linear polyester resin (B), wherein the non-linear polyester resin (A) is (i) a modified non-linear polyester resin (A1) produced by reacting a polyester resin (a1) having an active hydrogen on a terminal of the main chain with an extender (D), (ii) a modified non-linear polyester resin (A2) prepared by chemically bonding a polyester resin (a2) prepared from an alcohol component (y) and an unsaturated carboxylic acid component (z) or (iii) a modified non-linear polyester resin (A3) prepared by chemically bonding a polyester resin (a2) <EOS>