An image forming apparatus includes: an image forming unit; a toner bottle and a paper feed tray; sensors rendered operable immediately after the image forming apparatus is powered on, outputting detection signals that assume different values depending on whether remaining amount of toner or recording paper is lower than a prescribed value; a main control unit, rendered operable after a prescribed activating process after power-on of the image forming apparatus, for controlling the image forming unit; and an alarm device including an LED that is turned on to give an alarm if any consumable supply such as toner is in a near end state, in response to an output from the sensors.