A packing box for packaging of playing cards has, in an assembled state, a shape of a rectangular parallelepiped with six faces including front and rear faces, right and left side faces, and top and bottom faces. The packing box includes cut lines in two locations at a predetermined interval in parallel with a longitudinal direction of the rectangular parallelepiped, and a central band in a portion defined by the cut lines provided in the two locations. The right and left side faces of the packing box can be removed along the cut lines such that side edges of the playing cards within the packing box are exposed.