Foldable display case

A foldable display case, comprising:

• a case main body having a square plate shape;
• first connection portions protruding from respective first sides along a transverse direction intersecting a longitudinal direction of the case main body, of an outer edge portion of the case main body;
• second connection portions protruding from respective second sides along the longitudinal direction, of the outer edge portion;
• first side-wall portions extending along the transverse direction, each configured to be turnable between a first position where the first side-wall portion stands up from the case main body and a second position where the first side-wall portion falls down on the case main body, around the corresponding first connection portion, and each including first engagement portions;
• second side-wall portions extending along the longitudinal direction, each configured to be turnable between a third position where the second side-wall portion stands up from the case main body and a fourth position where the second side-wall portion falls down on the case main body, around the corresponding second connection portion, and each including second engagement portions;
• and
• joint portions provided at respective corners of the case main body, and each including third engagement portions engageable with and disengageable from the first engagement portions of the turning first side-wall portion, and fourth engagement portions engageable with and disengageable from the second engagement portions of the turning second side-wall portion,
• wherein
• each of the paired second side-wall portions includes a corner portion extending in the longitudinal direction,
• the corner portions are in contact with the respective second connection portions when the second side-wall portions are at the third position, and are separated from the case main body when the second side-wall portions are at the fourth position,
• each of the joint portions includes paired inner surfaces that form an L-shaped cross-section and are substantially orthogonal to each other, and
• the paired inner surfaces of the joint portions are in contact with the corner portions when the paired second side-wall portions are at the fourth position.