To provide a heat seal blade for a lateral seal roll, the lateral seal roll provided with the heat seal blade, and a filling machine provided with the lateral seal roll capable of suppressing the occurrence of a resin pool in a portion where a vertical seal part and a lateral seal part cross each other and the occurrence of a constriction portion in the lateral seal part. A heat-sealing tube comprising: A heat-sealing tube that is attached to peripheral surfaces of a pair of lateral seal rolls so as to extend in their axial direction, and that is formed by folding back one packaging film at a central portion or overlapping two packaging films and forming a vertical seal portion at least at an overlapping side edge portion, And a corner part of at least one heat seal blade of the pair of lateral seal rolls on a side...

You do not currently have access to this content.