An image forming apparatus comprises a first apparatus and a second apparatus. A cable-side connector of an electrical cable extending from the second apparatus is connected to a first-apparatus-side connector provided in the first apparatus. The cable-side connector is provided on a side of the first apparatus. The image forming apparatus comprises an opening portion provided in the first apparatus and through which the cable-side connector is connectable to the first-apparatus-side connector from an outside of the first apparatus; a lid that covers the opening portion; an attaching portion provided on the lid so as to attach the lid to the first apparatus; an engaging portion provided on the lid so as to be disengageably engaged with the opening portion; an outlet portion provided on the lid and through which the electrical cable extends to the outside of the first apparatus; and an attachment member attached to the electrical cable.