An image recording apparatus. A disposable part is detachably mounted therein. The apparatus includes a photosensitive member which is imagewisely exposed to a dots of beam in accordance with the signal of the image to be recorded. A counter counts clockpulses during the time when the signal of the image to be recorded being produced. Utilizing the output of the counter, the signal corresponding to the degree of consumption of the disposable or consumable part is generated.