An image carrier unit includes an image carrier, a charging device, and a unit housing. The charging device is attachably/detachably held in the unit housing, and electrically charges a surface of the image carrier. The unit housing integrally holds the image carrier and the charging device. The unit housing includes a light shielding member disposed at a first position at which the light shielding member blocks charge elimination light shone onto the image carrier from a charge elimination device provided on a side of the image forming apparatus such that the charge elimination light does not reach the charging device, the first position overlapping with an attachment-detachment path of the charging device. When detaching the charging device from the unit housing, the light shielding member moves from the first position to a second position retracted from the attachment-detachment path of the charging device.