Medium aligning apparatus, medium processing apparatus, and recording system

A medium aligning apparatus comprising:

• a discharge member that discharges a medium;
• a load tray including a load surface on which the medium discharged by the discharge member is loaded;
• a first aligning surface and a second aligning surface that align rear ends of a plurality of mediums loaded on the load tray;
• a discharge tray on which the mediums discharged from the load tray are mounted;
• and
• a wall surface that aligns the rear ends of the mediums on the discharge tray, wherein
• the first aligning surface and the second aligning surface are switchable to be selected to align the ends of the mediums while the mediums are being loaded on the load tray,
• either the first aligning surface or the second aligning surface is selected to align the ends of the mediums, and
• an angle formed between the wall surface and the second aligning surface is smaller than an angle formed between the wall surface and the first aligning surface.