Medium transporting apparatus, medium processing apparatus, and recording system

A medium transporting apparatus comprising:

• a medium tray on which a medium that has been discharged from a discharge portion that discharges the medium is mounted, the medium tray matching an end portion of the medium at a portion upstream in a discharge direction of the discharge portion;
• a paddle that comes in contact with the medium, which has been discharged on the medium tray, and that rotates, the paddle moving the medium towards a matching portion;
• and
• a low frictional resistance member configured to switch between an advanced state advanced from outside a medium mount region of the medium tray to the medium mount region, and a retracted state retracted from the medium mount region to outside the medium mount region, the medium mount region corresponding to an entire surface of the medium tray that is in contact with the medium, wherein
• the low frictional resistance member is switched from the retracted state to the advanced state after a first medium has been mounted on the medium tray, and is interposed between the first medium and a second medium when, after a discharge of the first medium, the second medium discharged from the discharge portion is moved towards the matching portion with the paddle, and
• in the retracted state, the low frictional resistance member is not in the medium mount region in a plan view as viewed along a direction normal to the medium mounted on the medium tray.