Packaging box

A packaging box 10 made of thin cardboard, paperboard or the like, and having a plurality of faces including a first face, wherein the first face 12 is provided with a first line of perforations 24 by which the box, when closed, can be at least partially opened; wherein the first line of perforations comprises a first perforation 24a and a plurality of second perforations 24b, the first perforation being longer than each of the second perforations, the box being openable by applying a force to the first face in the region of the first perforation, to initiate rupture of the first line of perforations and thereby at least partially open the box. Preferably, the first line of perforations is located along an edge of the box between the first and a second face 14. Second and third lines of perforations may extend across the second face. These lines may be arranged such that, after the first line of perforations has been ruptured, pulling on the second face causes the second and third lines to rupture and an openable region of the second face to open up. Also provided is a method of opening such a packaging box.