An image-forming apparatus includes a first developer container accommodating a first developing agent containing a dark-colored toner and a first carrier; a first developing agent-bearing member at the first developer container, that transports the first developing agent to a first developing region; a first unit for generating a magnetic field in the first developing region, disposed in the first developing agent-bearing member; a second developer container accommodating a second developing agent containing a light-colored toner and a second carrier; a second developing agent-bearing member at the second developer container, that transports the second developing agent to a second developing region; and a second unit for generating a magnetic field in the second developing region and disposed in the second developing agent-bearing member. Magnetic binding force applied to the second carrier in the second developing region from the second unit is larger than that to the first carrier from the first unit.