An adhesive tape application device has a stage (25) on which the tail end (5E) of a first tape member and the head end (5S) of a second tape member are placed in an overlapped manner, an ultrasonic tool (26) having projections arranged on its surface making contact with the head end (5S) or the tail end (5E) of the overlapped tape members, an ultrasonic vibration generation device (27) for applying ultrasonic vibration (28) in the tape thickness direction to the ultrasonic tool (26), and a pressing device for applying to the ultrasonic tool (26) a pressing force directed to the stage (25). The construction allows the tail end (5E) of the first tape member being used and the head end (5S) of the second tape member paid out from a new reel to be connected to each other by a simple and low cost structure in a condition where there is no possibility of trouble of tape feeding.