A developing device of an image forming apparatus to convey a developing agent, the developing device including a housing having a developing agent accommodating compartment disposed therein, a first rotation member and a second rotation member that are disposed inside the developing agent accommodating compartment, a plurality of developing agent convey members that rotate around the first rotation member and the second rotation member being arranged along a shaft direction of the first rotation member, and at least one torque limiter coupled to between the first rotation member and at least one of the plurality of developing agent convey members, the at least one torque limiter to allow at least one of the plurality of developing agent convey members to perform a relative rotation with respect to the first rotation member when a load is applied to the plurality of developing agent convey members is varied.