To attain the automation of die changing by dispensing with the cutting of wiring and connecting work which is previously performed.

This connector is provided with: a pair of feed bars 22a, 22b which have a plurality of clamping pawls 26a, 26b for holding a workpiece and with which the workpiece is continuously transported along a first to a forth forging die 12a-12d; detecting sensors 28 for detecting that the workpiece is clamped with clamping pawls 26a, 26b; a transmitting part 38 which is arranged on end part of the feed bar 22a and clamped signals from the detecting sensors 28 are fed and an output part 44 which is arranged in the noncontact state to a feed bar attaching and detaching part 30 of a transfer mechanism 24 which is provided on the side of the apparatus main part and with which a power source signal from an external power source is fed.