Abstract: There is provided a tab tape splicing apparatus for automatically fastening a tab tape on the adhesive surface of a rolled pressure-sensitive adhesive sheet at the end of the roll to provide a rolled pressure-sensitive adhesive tape with a tab at the leading end thereof. The apparatus comprises a rail fixedly mounted between a pair of upright frame members on both sides of a base to extend in the breadthwise direction of a pressure-sensitive adhesive sheet, a movable frame movable from side to side along the rail, a splicing roll attached to the movable frame for fastening a tab tape, a tape holder for holding a roll of tab tape, cutting means for cutting the tab tape, and means for moving the movable frame from side to side.