A two-component developing apparatus is provided with a developer carrying member for carrying the developer thereon to an image bearing member. An agitating chamber is provided with a screw member provided with fins on the rotary shaft thereof for agitating and carrying the developer, and a receiving port for receiving a supplied toner therein, and constituting a circulation route for the developer together with the developing chamber, more fins are provided in a second area spaced apart by a predetermined distance and more from the receiving port toward the downstream side thereof with respect to a developer carrying direction than in a first area near the receiving port.