To provide a pressure gas feed-in device enabling a nozzle to be easily attached to and detached from the outlet hole of a pressure gas source or the tip of an air feed hose subsequent to the outlet hole by preventing the nozzle from being coming out.

The body part of the nozzle 11 having an air filling tube at the front end of the body part 12 is properly fitted into a tubular ferrule 3 connected to the pressure gas source to a predetermined depth, and the outer part of an engagement piece 9 engageable, at its inner end, with the body part of the nozzle 11 is locked to the front end of an operation lever 6 pivotally supported on the outside of the tubular ferrule 3 so as to be rotated in the inner and outer directions. When the operation lever 6 is rotated, the inner end of the engagement piece 9 is projected from or recessed to the inner side of the tubular ferrule 3 to engage or disengage the engagement piece with or from the body part of the nozzle 11.