An image forming apparatus includes an image forming unit configured to form an image on an image bearing member based on an image forming condition; a transfer unit configured to transfer the image formed on the image bearing member onto a sheet; a first reading sensor configured to read a first image for adjustment which has been formed on the sheet; a second reading sensor configured to read a second image for adjustment which has been formed on the image bearing member; and a controller configured to: generate the image forming condition based on reading results of the first image for adjustment on a plurality of sheets, which are obtained by the first reading sensor; and generate the image forming condition based on a reading result of the second image for adjustment, which is obtained by the second reading sensor.