An image forming apparatus includes an image bearing member, a developing device, a driving device, and a controller. The developing device includes a developing container, a first feeding member, a second feeding member, a developer carrying member, a content sensor, and a sealing member. Wherein when the controller executes an initializing operation for removing the sealing member from the first opening and the second opening while driving the first feeding member and the second feeding member, the controller provides notification of abnormality when the controller discriminates that an amount of the developer in the second chamber is larger than a predetermined amount at a predetermined timing on the basis of an output of the content sensor.