To prevent any deformation in absorbing a collisional impact even in the case where a nozzle gas collided with a work or the like by installing an impact absorbing part for absorbing any impact at the time of a collision.

A nozzle 201 is provided with a cylindrical component 201a, an impact absorbing part 202, a tip part 203 or the like. This cylindrical component 201a of the nozzle 201 is provided with a taper part 201b. In this constitution, the impact absorbing part 202 is detachably installed in space between a lower end of this taper part 201b and the tip end 203 by means of screwing. The impact absorbing part 202 is a part that absorbs any impact in the case where the tip part 203 or the like has collided with a work and the like, by way of example. This impact absorbing part 202 is the weakest in strength than the cylindrical component 201a and the tip part 203, therefore at the time of being shocked, this impact absorbing part 202 is so designed as to be broke down.