Disclosed is an image forming apparatus including a reverse-feeding unit. The reverse-feeding unit includes a frame which forms a first feeding path along which a printing medium is fed and a second feeding path which is branched off from the first feeding path, a guide plate which rotates between a first position in which the printing medium fed along the first feeding path is supported and a second position in which the supported printing medium is directed towards the second feeding path, and a plate driving unit which comprises an actuator which actuates the guide plate, a driving source which drives the actuator, and an electronic clutch which selectively transmits a driving force of the driving source to the actuator.