An image forming apparatus that can improve the workability during maintenance, and the compactness and neatness of the signal line and the power source line, and moreover can lower the cost by eliminating the fall preventing member. The image forming apparatus has: an engine main body which has an image forming device, a transfer device, a fixer, and a transporter. There is a rear surface unit which has housed items such as a power source device, a control device, and an exhaust device, and which is configured to be detachable from the engine main body. One end of the control device is rotatably linked to the engine main body while the other end thereof is rotatably linked to the unit main body.