An image forming device includes a main body casing, a cover configured to be openable and closable with respect to the main body casing, a sensing unit configured to sense an opening-closing operation of the cover, a forming unit configured to form an image on a sheet, a detecting unit configured to perform a detecting operation to detect a deviation of an image forming position of the image to be formed by the forming unit, an accepting unit configured to accept a print request, and a control unit configured to control the detecting unit to perform the detecting operation (6) in response tothe print request (7) being accepted when the sensing unit senses an opening-closing operation (1,4) of the cover after execution of a previous detecting operation, and thereafter to control the forming unit to form the image (8) in the image forming position corrected to cancel the deviation detected in the detecting operation.