Packaging material and packing material

A packaging material comprising:

• a first surface part that is adjacent to one side of a boundary line and has a bottom plate on which an object to be packaged is placed;
• and
• a second surface part that is adjacent to the other side of the boundary line and has a top plate that holds and wraps the object to be packaged with the bottom plate in a state of being folded along the boundary line, the boundary line being interposed between the first surface part and the second surface part,
• wherein the bottom plate and the top plate are rectangular regions where one corner of the bottom plate and one corner of the top plate are in direct contact with each other at the boundary line, and
• portions of the first surface part and the second surface part, which are located outside four respective sides of each of a rectangular shape of the bottom plate and the top plate, are folding portions that are foldable at the four respective sides of each of the bottom plate and the top plate.