Patent ID: 8567781

Claim:
A medium transport device comprising: a rotating member that forms a nip region with a facing member and feeds a sheet medium through the nip region by rotating; a guide member that is configured to rotate in a first direction and in a second direction around an axis that is located at a predetermined position, the second direction being opposite to the first direction, the guide member guiding the sheet medium, which has been sent out from the nip region by the rotating member, in an intended direction; a protrusion that serves as a positioning reference for the guide member; and a restricting member that is disposed on the guide member and that includes first and second surfaces that come into contact with the protrusion, the restricting member restricting rotation of the guide member in the first direction such that the guide member does not rotate beyond a position at which the first surface is in contact with the protrusion and at which the guide member guides the sheet medium in the intended direction, the restricting member restricting rotation of the guide member in the second direction such that the guide member does not rotate beyond a position at which the second surface is in contact with the protrusion and at which the guide member is not in contact with the facing member.