An apparatus for setting sheet materials having a sheet material setting member pivotably supported to a sheet material processing apparatus, an auxiliary member for enhancing a sheet material setting area, and a restricting member for restricting pivotal movement of the auxiliary member in a midway of the movement when the auxiliary member pivotally moves according to pivotal movement of the sheet material setting member. The auxiliary member pivotally moves in a reverse direction according to the pivotal movement of the sheet material setting member when it restricted by the restricting member.