To obtain a fluid jet device which increases the capacity of a jet valve and has an inexpensive cost and an excellent capacity and reduces the number of parts and further, saves resources and energy.

The upper end of the support cylinder 3 of a jetting head is inserted in the lower end opening of the jetting head 1 and the support cylinder 3 and the jet opening 2 are integrally formed. An inward circular projection 4 at the lower end of the jetting head 1 is fixed to the upper circular projection 6 of the container 5. A manipulating piece 7 integrally formed with the jet opening 2 is suspended downward to jet the fluid from the jet opening 2.