PURPOSE: To dispense with any screw feed hose to a tip part of an automatic thread fastening machine, and facilitate a movement to a thread fastening spot as well as to make improvements in the extent of working properties by housing a driver and a screw conveying air pipe both in the inner part of the same grip.

CONSTITUTION: A screw 10 is fed to a screw holder 4 by compressed air from a screw feeder by way of a guide pipe (air pipe) 5 stored in a grip 7 together with a driver 1. At this time, since the guide pipe 5 serves as a screw feed part and a slide guide of the grip 7 in combination, a thread fastening machine is simplifiable in structure and simultaneously its miniaturization and lightweightiness is well promotable.