Sheet processing apparatus equipped with lateral displacement correction function

A sheet processing apparatus comprising:

• a conveying unit configured to convey a sheet along a conveying path;
• a detection unit provided in the conveying path and configured to detect a position of the sheet in a width direction orthogonal to a conveying direction;
• a correction unit configured to correct the position of the sheet in the width direction based on a result of detection by said detection unit;
• a stacking unit on which the sheet discharged via the conveying path is stacked;
• an alignment unit disposed above said stacking unit and including a pair of alignment members which are movable in the width direction, said alignment unit being configured to bring said pair of alignment members into abutment with opposite edges of the sheet having been discharged to thereby align the sheet;
• an acquisition unit configured to acquire a type of a sheet;
• and
• a control unit configured to, in a case where the sheet type is a type that is not subjected to correction by said correction unit, control said alignment unit such that a distance between said pair of alignment members in a standby position is set larger than that in a case where the sheet type is a type that is subjected to correction by said correction unit.