Sheet storage apparatus and sheet processing apparatus

A sheet storage apparatus comprising:

• an attachment unit to which a storing bag for sheets is attached;
• a holding unit that holds the sheets toward an inner side in a storage direction of the storing bag attached to the attachment unit, the sheets being stacked and stored in the storing bag;
• and
• a closing unit that closes an entrance of the storing bag by sandwiching the storing bag from outside thereof,
• wherein the closing unit comprises a first closing unit and a second closing unit,
• wherein the first closing unit and the second closing unit move simultaneously to close the entrance,
• wherein the first closing unit closes the entrance by moving from a first position to a second position, the first position being a position before the first closing unit starts sandwiching the storing bag, the second position being a position when the first closing unit sandwiches the storing bag together with the second closing unit,
• wherein the second closing unit closes the entrance by moving from a third position to a fourth position, the third position being a position before the second closing unit starts sandwiching the storing bag, the fourth position being a position when the second closing unit sandwiches the storing bag together with the first closing unit,
• wherein the first closing unit passes through a position closer to the inner side in the storage direction than the first position between moving from the first position to the second position,
• wherein the second closing unit passes through a position closer to the inner side in the storage direction than the third position between moving from the third position to the fourth position, and
• the first position and the third position are located on an outer side in the storage direction from a position where the holding unit that holds the sheet is in contact with the sheet.