SCREW TERMINAL DEVICE AND ATTACHMENT PLUG USING THE SAME

PROBLEM TO BE SOLVED: To provide a screw terminal device, in which a terminal screw is difficult to be loosened, and an attachment plug using the same.SOLUTION: A screw terminal device 10A comprises a terminal plate 12 provided with an insertion hole 12a, in which a terminal screw 11 is inserted, and a fastening plate 13 provided with a screw hole 13a, to which the terminal screw 11 passing through the insertion hole 12a is fastened. The fastening plate 13 has a rectangular plate shape, and is provided with a screw hole 13a at a center, and protrusions 13b at centers of right and left side faces. The terminal plate 12 has a rectangular plate shape, and is provided with the insertion hole 12a at a center, and two locking pieces 12b projecting toward the fastening plate 13 from both of upper and lower side parts and locked to the protrusions 13b from both of upper and lower sides at right and left side edges, respectively. The locking pieces 12b and the protrusions 13b of the fastening plate 13 are locked with each other, so as to restrain rotation of the fastening plate 13 relative to the terminal plate 12.