PURPOSE: To easily change a nozzle, to effectively prevent clogging of any impurity and to prevent cavitation without mixing air into ejected water so as to acquire high efficiency.

CONSTITUTION: A high pressure pipe 10 having a nozzle body 13 inside and a suction pipe 20 with a suction port 23 opened in its middle part are connected in series with each other via flange joints 12 and 21a so as to be separable from each other, and also the outer peripheral part of the nozzle body 13 in the high pressure pipe 10 and downstream side part of the suction port 23 of the suction pipe 20 are linked with each other by means of a linking bar 60 and a guiding blade 24 is provided for guiding sucked water flowing into the suction pipe 20 form the suction port 23 in an ejecting direction.