An image forming apparatus includes an image bearing member for bearing an electrostatic latent image, and a developing device including a container for accommodating the developer, a developer carrying member for carrying the developer and for developing the electrostatic latent image with the developer, a developer supplying member for supplying the developer to the developer carrying member, and stirring member for stirring the developer and for feeding the developer to the developer supplying member. In addition, a controller controls, before image formation, a stirring operation by the stirring member on the basis of information on electrostatic capacity between the developer carrying member and the developer supplying member.