PURPOSE: To easily and accurately join the ends of two component adhering tapes on which a large number of electronic components are contained, by an adhesive tape.

CONSTITUTION: The present component adhered tape joining jig 10 is equipped with a jig main body 11 with a pair of tape contact surfaces 11a, 11a, and a pair of tape holding bodies 12, 12 which press and pinch respective end parts 1a, 1b of two component adhering tapes 1, 1 on respective tape contact surfaces 11a. Three positioning pin 18 are provided at locations which are confronted with respective positioning holes 4 of respective component adhering tapes on respective tape contact surfaces 11a. A round hole 12a in which each positioning pin 18 is inserted is respectively formed on each tape holding body 12. Each tape holding body 12 is supported in such a manner that each tape holding body 12 is rotatable to each tape contact surface 11a which corresponds with the tape holding body, by each hinge 13. Each notch 12b for an adhesive tape affixing window is respectively formed on the border side of a pair of tape holding bodies 12, 12 in such a manner that the notches 12b may be confronted to each other.