A scanning device has a controller which is configured to judge whether the scanning device is to be operated in a conveyed sheet scanning mode in which the controller controls a conveying unit to convey a sheet and control the scanning unit to scan images on the sheet being conveyed, or in a held sheet scanning mode in which the sheet stationarily held by a sheet table is scanned, to display functions related to the conveyed sheet scanning mode on a display unit in a first prioritized manner when the controller judges that the scanning device is to be operated in the conveyed sheet scanning mode, and to display functions related to the held sheet scanning mode on the display unit in a second prioritized manner when the controller judges that the scanning device is to be operated in the held sheet scanning mode.