Packaging box

A packaging box comprising:

• a bottom case having a bottom plate and a side plate erected from a peripheral edge of the bottom plate, a first coupling part being formed in the side plate;
• a covering case having a top plate and a side plate suspended from a peripheral edge of the top plate, a second coupling part being formed at a position corresponding to the first coupling part of the side plate;
• and
• a buffering member disposed around a packaged article on the bottom plate,
• the packaging box being configured by inserting the side plate of the covering case inside the side plate of the bottom case and then coupling the first coupling part and the second coupling part to each other,
• wherein the buffering member is formed with a protruding piece protruded on the bottom plate in a direction of the side plate of the bottom case, in which by causing the protruding piece to abut against the side plate of the bottom case, a gap into which the side plate of the covering case can be inserted is formed with respect to the side plate of the bottom case,
• the bottom plate is formed with a space in which the protruding piece can be housed, at a position corresponding to the protruding piece of the buffering member, and
• when the side plate of the covering case is inserted inside the side plate of the bottom case, the protruding piece of the buffering member is pressed by the side plate of the covering case and then folded to be housed in the space.