To provide a T-nut driving machine which can surely drive a T-nut by simple operations.

It can be made possible to surely press the whole surface of a flange part using a push bar larger in outer diameter than the flange part of a T-nut 6 by letting a machine be provided with a shoot 7 carrying a plurality of T-nuts fed from a T-nut supplier to a driving position in order continuously, a push bar 9 driving the T-nut 6, and with cam mechanisms 18 and 21 which evacuate the shoot 7 from the T-nut driving position while being interlocked with the T-nut driving operation of the push bar 9. Beside, the provision of a position restricing guide plate 24b for preventing the dislocation of the push bar 9, thereby allows sure driving operations to be actualized by driving an air cylinder 10.