To provide an angular, tubular paper box which is rich in flavor nature on appearance and suitable for planning the reduction of used materials, and also for mechanical production.

The angular, tubular packaging box which makes a paper box of a cross section square of which the four circumferential side walls 1, 2, 3 and 4 orthogonally intersect mutually with a standard form is that the first circumferential side wall 1 and the second circumferential side wall 2 are connected through the first connecting slant-wise wall 11. The fourth circumferential side wall 4 is connected with the third circumferential side wall 3 through the second connecting slant-wise wall 12. The respective connecting slant-wise walls 11, 12 are set narrower in width from the circumferential side walls 1, 2, 3 and 4. The first to second auxiliary flaps 14, 15 are continuously provided through folds 45, 50 on the upper edges of the respective connecting slant-wise walls 11, 12. The second auxiliary flap 15 is formed into such a configuration that the side edge abuts with the internal surface of the third circumferential side wall 3 under the assembled condition of the paper box. The first to second auxiliary flaps 11, 12 are continuously provided through valley folds 54, 56 to connecting pieces 19, 18 continuously provided through crest folds 53, 55 from the end of the first inner flap or 13.