To prevent a burr, produced from the joint portion by welding between a liquid agent container and an injection unit, from interfering with a boring member inserted into a jig communication passage when the boring member is inserted into the jig communication passage to prevent the obstruction of the piercing action through a sealing member by the edge of the boring member. In the sealing pump-up device 10, a tubular inner annular member 104 is integrally formed on the inner peripheral side of a joined portion 37 in an injection unit 20 so as to surround, from an outer peripheral side, a boring member 62 held in a jig insertion hole 44, and a burr housing unit 106 consisting of an almost cylindrical space is formed between the outer annular member 28 of a liquid container 18 and the tubular inner annular member 104, whereby it is possible to guide the tip end side of a burr 110, extending from the joint portion between the outer annular member 28 and a joined portion 37 toward the inner peripheral side, from moving toward the boring member 62 side of the burr 110 by means of the tubular inner annular member 104.