Image forming apparatus

An image forming apparatus using a two-component developer containing a toner and a carrier, comprising:

• a latent image bearing member for bearing an electrostatic latent image;
• a toner bearing member opposed to the latent image bearing member and adapted to bear the toner to be conveyed to a development region to develop the electrostatic latent image;
• a developer bearing member opposed to the toner bearing member and adapted to bear the two-component developer and supply the toner in the two-component developer to the toner bearing member;
• and
• a regulator for setting the thickness of a toner layer carried on the toner bearing member to 6 μm to 15 μm and setting a difference between a half width of a first toner charge number distribution as a number distribution of the charge amount of the toner carried on the toner bearing member and that of a second toner charge number distribution as a number distribution of the charge amount of the toner in the two-component developer carried on the developer bearing member to 0.8 (10−10 C/m) or smaller.