Box and box material

A flat plate-shaped box material that is able to form, by being bent, a box provided with a storage section in which a storage space for storing articles is defined and a lid section that covers an upper side of the storage section,

• wherein, in a state in which the box is formed, the storage section has
• an inner circumferential wall section that surrounds the storage space and opens in an up-down direction,
• an outer circumferential wall section that surrounds the inner circumferential wall section and forms a gap with the inner circumferential wall section,
• a wall top plate section that is connected to an upper end of the inner circumferential wall section and an upper end of the outer circumferential wall section via creases, and
• a bottom plate section that covers a lower side of the storage space and configures a bottom section of the storage section, in the state in which the box is formed, the outer circumferential wall section has a first outer wall section on one side in a first direction perpendicular to the up-down direction,
• in a state in which the box is formed and the lid section is opened, the first outer wall section is able to be opened and closed to an outside of the storage section, and, in a state in which the box is formed and the lid section is
• closed, the lid section has a side plate section that covers an outer surface of the first outer wall section.