PROBLEM TO BE SOLVED: To provide a tube joint device capable of suitably preventing problems such as a time-out error and poor jointing from being caused because a used cut member is left in the device.SOLUTION: When a fusing operation using an unused wafer WF1 before use for fusion is started, a control part 100 provided in the tube joint device 1 performs operation control to limit progress of the fusing operation in the case where it is detected that a used wafer WF2 is left in a discharge position PS2.