ELECTROSTATIC CHARGE IMAGE DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD

An electrostatic charge image developer contains a toner including toner particles that contain a binder resin, and an external additive, and a carrier having a true specific gravity of 3.0 g/cm3 or more and 4.0 g/cm3 or less, in which, in a dynamic viscoelasticity measurement of the toner, in a case where a loss tangent tan δ at a temperature of 90° C. and a strain of 1% is represented by D1 (90), a loss tangent tan δ at a temperature of 90° C. and a strain of 50% is represented by D50 (90), a loss tangent tan δ at a temperature of 150° C. and a strain of 1% is represented by D1 (150), and a loss tangent tan δ at a temperature of 150° C. and a strain of 50% is represented by D50 (150), each of D1 (90), D50 (90), D1 (150), and D50 (150) is 0.5 or more and 2.5 or less, a value of D50 (150)−D1 (150) is less than 1.5, and a value of D50 (90)−D1 (90) is less than 1.0.