A fluid jet device (1) being provided with a fluid jet aperture section and producing a jet of fluid from the fluid jet aperture section includes: a pulsation generation section (101) including a fluid chamber (113) whose capacity can be changed, an inlet fluid path (114) linked through the fluid chamber with a volume smaller than that of the fluid chamber, and an outlet fluid path (112) linked through the fluid chamber and the fluid jet aperture section with an inertance set smaller than that of the inlet fluid path and a pressure generation section (401) that supplies the fluid to the inlet fluid path.
