To provide an adhesive tape joining apparatus, adhesive tape joining apparatus including: a pair of back and forth joining rollers which joins the adhesive tape to a main body that is moved and operated along the tape joining face of the workpiece by pressing the adhesive tape against the tape joining face and can be elastically transformed; a first guide roller which is engaged with the outer face of the workpiece being different from the tape joining face at a front position of the joining roller; and a pair of back and forth second guide rollers which is engaged with the workpiece at the portion of the opposite side of the tape joining face; wherein the first guide roller is mounted on the main body being fixed at a predetermined position thereof and the second guide roller is mounted on a movable bracket which is attached to the main body; and the movable bracket is biased to the side of the joining roller by an elastic body.