An image forming device includes an image forming part which forms an image on a recording medium (92); a recording medium switchback portion (51) which receives the recording medium on a first run, one side of which has been printed when passing the image forming part, and sends the recording medium for a second run; a recording medium path (56) which communicates with the recording medium switchback portion so as to send the recording medium to and from the recording medium switchback portion; an inverted recording medium transfer path (58) through which the recording medium is sent to the image forming part again with an upper surface and a lower surface of the recording medium reversed; and a recording medium transfer part which transfers the recording medium along the inverted recording medium transfer path. The image forming device is further provided with a first recording medium receiving portion (42) which stores the recording medium one on another with a printed surface facing downwards; and a first recording medium ejection path (41) which communicates with the recording medium receiving portion so as to send the recording medium to the first recording medium receiving portion.