PACKAGING MACHINE

A packaging machine (1) for forming a box (30) by folding a blank around the periphery of a plurality of smoking articles, including a conveyance path (26) for thereafter conveying the box (30) to a subsequent processing stage, wherein the box (30) includes a longitudinal axis (32), and a pair of side walls (30e) having inner and outer side wall parts (34a, 34b) which extend along the longitudinal axis (32) and are bonded to each other, and assumes a posture in which the pair of the side walls (30e) extend in a direction traversing the conveyance path (26) in the conveyance path (26); the conveyance path (26) has a pair of conveyance walls (28a) for holding therebetween the box (30) by the pair of side walls (30e), and includes a conveyor (28) for conveying the box (30) while holding the same between the conveyance walls (28a); the pair of conveyance walls (28a) respectively include pressing wall surfaces (28d) for substantially pressing the side walls (30e); and at least one of the pressing wall surfaces (28d) includes means (56, 58, 60) for reducing a total effective length (L) of the pressing wall surface (28d) along the longitudinal axis (32) to be less than an overall length (La) of the side wall (30e).