A packing machine for producing an inner container by folding an inner blank about a wrapped group of tobacco articles; wherein the inner container is cup-shaped, has one open upper end and is provided with a lid, which is hinged to a rear wall of the inner container along a hinge to rotate, with respect to the inner container itself, between an open position and a closed position of the open upper end; and wherein the inner blank has two longitudinal fold lines and a number of transverse fold lines which define, between the two longitudinal fold lines, at least a first panel forming the rear wall of the inner container, a second panel forming a front wall of the inner container, a third panel forming a bottom wall of the inner container, a fourth panel forming a rear wall of the lid, and a fifth panel forming an top wall of the lid; the packing machine is characterized in that: the inner blank comprises a sixth reinforcing panel (12") for the fifth panel, a seventh reinforcing panel (13") for the fourth panel and an eighth reinforcing panel (10") for the first panel; the packing machine comprises: first folding means (70, 71, 72, 73) which fold the inner blank, before being coupled to the wrapped group of tobacco articles, to form the hinged lid and to overlap at least the eighth reinforcing panel (10") at least on the first panel during the forming of the lid; a feed station which couples the partly folded inner blank to the wrapped group of tobacco articles so that a rear wall of the wrapped group of tobacco articles rests on the first panel; second folding means (96, 97) arranged downstream from the feed station and which further fold the inner blank about the wrapped group of tobacco articles to complete the production of the inner container; an opening device which is arranged upstream of the feed station and rotates the formed lid from the closed position to the open position; and a closing device which is arranged between the feed station and the second folding means (96, 97) and rotates the formed lid from the open position to the closed position. the inner blank comprises a sixth reinforcing panel (12") for the fifth panel, a seventh reinforcing panel (13") for the fourth panel and an eighth reinforcing panel (10") for the first panel; the packing machine comprises: first folding means (70, 71, 72, 73) which fold the inner blank, before being coupled to the wrapped group of tobacco articles, to form the hinged lid and to overlap at least the eighth reinforcing panel (10") at least on the first panel during the forming of the lid; a feed station which couples the partly folded inner blank to the wrapped group of tobacco articles so that a rear wall of the wrapped group of tobacco articles rests on the first panel; second folding means (96, 97) arranged downstream from the feed station and which further fold the inner blank about the wrapped group of tobacco articles to complete the production of the inner container; an opening device which is arranged upstream of the feed station and rotates the formed lid from the closed position to the open position; and a closing device which is arranged between the feed station and the second folding means (96, 97) and rotates the formed lid from the open position to the closed position. first folding means (70, 71, 72, 73) which fold the inner blank, before being coupled to the wrapped group of tobacco articles, to form the hinged lid and to overlap at least the eighth reinforcing panel (10") at least on the first panel during the forming of the lid; a feed station which couples the partly folded inner blank to the wrapped group of tobacco articles so that a rear wall of the wrapped group of tobacco articles rests on the first panel; second folding means (96, 97) arranged downstream from the feed station and which further fold the inner blank about the wrapped group of tobacco articles to complete the production of the inner container; an opening device which is arranged upstream of the feed station and rotates the formed lid from the closed position to the open position; and a closing device which is arranged between the feed station and the second folding means (96, 97) and rotates the formed lid from the open position to the closed position.