Sheet storage device and image formation system including same

A sheet storage device comprising:

• a setting plate on which a sheet is set;
• a regulation cursor supported in a manner capable of reciprocating in a horizontal direction, the regulation cursor being configured to contact an edge of the sheet on the setting plate from a predetermined direction, so as to regulate positional deviation of the sheet in the predetermined direction;
• and
• a hold mechanism configured to stationarily hold the regulation cursor, wherein
• the hold mechanism includes a guide shaft extending in the predetermined direction, and a stopper linked with the regulation cursor, the stopper having a guide hole in which the guide shaft is inserted, and being capable of reciprocating with the regulation cursor along the guide shaft,
• the stopper is capable of inclining to one side in the predetermined direction on a fulcrum of a hole side end part having the guide hole,
• when the stopper is inclined to the one side, an inner edge of the guide hole contacts the guide shaft so as to generate frictional resistance, which restricts movement of the regulation cursor with the stopper, and when the stopper is raised to the other side opposite to the one side from the state where movement of the regulation cursor is restricted, the regulation cursor is enabled to move with the stopper,
• the stopper has a contact part, and
• the contact part contacts the regulation cursor, so as to restrict the stopper from inclining to the other side, when the regulation cursor is enabled to move.