A tape attaching method for attaching a tape to a workpiece includes a placing step of placing the workpiece with respect to the tape, which has a base material and an adhesive layer on the base material, in such a manner that the adhesive layer is in contact with an attached face of the workpiece, and a close contact step of causing, after the placing step is performed, a ball to roll in contact with the base material of the tape, thereby to bring the tape in close contact with the workpiece.