PURPOSE: To connect a piston slider of a nozzle for washing easily and securely by dividing it into front and rear parts and fitting and connecting them detachably and facilitate exchange and repair of the nozzle main body and a front slider.

CONSTITUTION: A washing nozzle main body 7 is fitted in an front end of a piston slider 1 detachably in such a manner that it cannot turn. The piston slider 1 is formed by fitting and connecting a front slider 8 and a rear slider 9 detachably. The rear slider 9 is stored in a cylinder 2 in such a manner that its front part protrudes from an opening 4 in a front end wall section 3 of the cylinder 2 and that it cannot turn and can slide freely in the longitudinal direction. The piston slider 1 is engaged in such a manner that a guide projection 11 provided on outer periphery of a rear end part 6 slides in a guide recessed groove 10 on inner face of the cylinder 2 freely. A spring 5 is fitted on outer periphery of the piston cylinder 1 between the rear end 6 of the piston slider 1 and the front end wall section 3 of the cylinder 2 and the piston cylinder 1 is springily energized backward.