A packing box includes a separation line in a shipping configuration, the separation line allowing separating a separation part from the packing box to leave a display part in a display configuration. First to last panels are sequentially interconnected, and flaps are connected to the panels. The flaps cooperatively define further sides of the packing box in the shipping configuration, and adjacent flaps connected to adjacent mutually connected panels are attached to one another. The separation line extends through a single panel from a first end associated with a position between adjacent first separation and display flaps to a second end associated with a position between adjacent second separation and display flaps, the separation flaps being associated with the separation part and the display flaps being associated with the display part. The separation flaps, and the adjacent display flaps are attached to one another, respectively, in a releasable manner.