An image forming apparatus includes an image forming unit configured to form an image by using a developer, and a controller configured to control the image forming unit to form a test image on the sheet, acquire information related to the test image, and correct, based on the information, a position on the sheet, wherein the test image is used to detect positional deviation, wherein the controller performs first processing in which the image forming unit forms the test image and a first pattern image, and second processing in which the image forming unit forms the test image and a second pattern image, wherein the image forming unit forms the first pattern image so that an adhesion amount of the developer becomes a first amount, and the second pattern image so that an adhesion amount of the developer becomes a second amount that is larger than the first amount.