Patent ID: 7607565

Claim:
A package box comprising: a box body having an opening through which an article to be packaged can be put into and taken out of the box body; a first connection piece which is integrally and continuously connected to one side of the opening and which is folded toward an inner wall of the box body; a partition plate which is integrally and continuously connected to the first connection piece and which partitions an accommodation space surrounded by the box body into an upper first accommodation portion and a lower second accommodation portion when the partition plate is folded into the box body; a second connection piece integrally and continuously connected to another side of the opening which is substantially perpendicular to the one side; a held plate which is integrally and continuously connected to the second connection piece and which is folded toward the inside of the box body such that the first accommodation portion is formed with a third accommodation portion; and an unfolding preventing portion which is provided on the first connection piece and which prevents the held plate folded toward the inside of the box body from unfolding open, wherein the unfolding preventing portion includes an insertion piece projecting from an edge of the held plate, a first engaging portion which is formed on the first connection piece to engage with a side of the held plate, the side being formed by bending the held plate and the insertion piece, and a second engaging portion which is formed on the first connection piece and which engages with an upper side of the insertion piece when the held plate is folded toward the inside of the box body.