Abstract: A box-erecting machine comprising a support structure and a rotatable head mounted on the support structure for rotation about an axis, the rotatable head carrying a plurality of four-cornered mandrels, means for displacing each mandrel away from and towards the rotatable head, and means for rotating the rotatable head in discrete steps so as to locate each mandrel at consecutive erecting stations of the machine and thereby to permit progressive erection of a rectangular box through the erecting stations from a blank of sheet-like material with corner posts located and connected in each of the four corners of the box.