A splicing device comprising: a tape connecting unit that has a stationary pressing member and a movable pressing member, which can switch between an open position opened to the stationary pressing member and a closed position close to the stationary pressing member, wherein in the open position, a splice tape is arranged across the movable pressing member and the stationary pressing member, wherein in the open position, a first connecting end portion of a first tape and a second connecting end portion of a second tape are arranged on a surface of a portion of the stationary pressing member side within the splice tape, and wherein by the open position being switched over to the closed position, the movable pressing member is close to the stationary pressing member, the movable pressing member is overlapped with the stationary pressing member in a front and rear direction, the splice tape is folded between the movable pressing member and the stationary pressing member, the first connecting end portion and the second connecting end portion are clamped by the splice tape from the front and rear direction, and the first connecting end portion and the second connecting end portion are connected to each other, characterized in that the splicing device further comprises: an elastic member that is configured to return the movable pressing member to be automatically switched over from the close position to the open position; and a regulating unit that is configured to regulate a return motion of the movable pressing member using the elastic member, when the open position is switched over to the closed position, if an actual movement amount of the movable pressing member does not reach a predetermined movement amount which enables the first connecting end portion and the second connecting end portion to be connected to each other. a tape connecting unit that has a stationary pressing member and a movable pressing member, which can switch between an open position opened to the stationary pressing member and a closed position close to the stationary pressing member, wherein in the open position, a splice tape is arranged across the movable pressing member and the stationary pressing member, wherein in the open position, a first connecting end portion of a first tape and a second connecting end portion of a second tape are arranged on a surface of a portion of the stationary pressing member side within the splice tape, and wherein by the open position being switched over to the closed position, the movable pressing member is close to the stationary pressing member, the movable pressing member is overlapped with the stationary pressing member in a front and rear direction, the splice tape is folded between the movable pressing member and the stationary pressing member, the first connecting end portion and the second connecting end portion are clamped by the splice tape from the front and rear direction, and the first connecting end portion and the second connecting end portion are connected to each other, characterized in that the splicing device further comprises: an elastic member that is configured to return the movable pressing member to be automatically switched over from the close position to the open position; and a regulating unit that is configured to regulate a return motion of the movable pressing member using the elastic member, when the open position is switched over to the closed position, if an actual movement amount of the movable pressing member does not reach a predetermined movement amount which enables the first connecting end portion and the second connecting end portion to be connected to each other. an elastic member that is configured to return the movable pressing member to be automatically switched over from the close position to the open position; and a regulating unit that is configured to regulate a return motion of the movable pressing member using the elastic member, when the open position is switched over to the closed position, if an actual movement amount of the movable pressing member does not reach a predetermined movement amount which enables the first connecting end portion and the second connecting end portion to be connected to each other.