CARDBOARD BOX PRODUCTION DEVICE, BOX PRODUCTION METHOD, AND BOX PROCESSING METHOD

[Problem] To provide a box making device and a box making method suitable for box making of a small-sized corrugated cardboard box[Means for Resolution] A box making device for making a corrugated cardboard box in which upper and lower sides are opened, includes: a stocker 1 that holds a plurality of folded original boxes of corrugated cardboard boxes in a state in which the plurality of folded original boxes are placed in such a way that upper and lower sides thereof are positioned along a vertical direction and stacked next to each other; a development unit 20 that is provided on an upstream side in a conveyance direction substantially orthogonal to a stacking direction of the original boxes, and develops the original box by moving one side surface of the original box from a first side that is the stocker side to a second side spaced apart from the first side in order for each opening to be formed on the upper and lower sides; a folding unit that folds a lower portion of the opened box developed at the upstream side in the conveyance direction; a feeding unit 40 that feeds the box from the upstream side to a downstream side in the conveyance direction; a conveying belt unit 50 that conveys the opened box to the downstream side while pressing both side surfaces of the opened box fed by the feeding unit; and a sticking unit 60 that sticks an adhesive tape to a bottom portion of the box in a conveyance region of the conveying belt unit 50.