File

A file comprising:

• a holding sheet body including a sheet section extended in one direction and including a holding section configured to cause the sheet section to hold an object to be held;
• a first cover body to which one end in an extending direction of the sheet section is connected;
• a second cover body to which another end in the extending direction of the sheet section is connected;
• and
• a first engaging section configured to engage the first cover body and the second cover body, wherein
• a plurality of creases are provided in the sheet section in the extending direction, the plurality of creases extending in a direction orthogonal to the extending direction and along a surface that holds the object to be held, and the sheet section is capable of transitioning to a folded state of being folded like a bellows in the creases and an expanded state of being expanded with the creases folded back,
• the first cover body includes a main cover section capable of closing along the holding sheet body in the folded state and a sub-cover section capable of opening and closing relatively to the main cover section, and
• the first engaging section engages the second cover body and the sub-cover section in a state in which the sub-cover section is placed along the second cover body, and
• the first engaging section includes a moving mechanism configured to enable relative movement of the first cover body and the second cover body to change a distance between a connection part of the holding sheet body in the first cover body and a connection part of the holding sheet body in the second cover body.