To provide a jet pump capable of sufficiently preventing blockage in water injection holes.

This jet pump 2 comprises a suction pipe 4, an annular member 8 mounted coaxially outside a downstream end of the siphon 4 and having several water injection holes, an exhaust pipe 20 connected with the srection pipe 4 via the annular member 8, plural injection nozzles 18 connected with the water injection holes 16 of the annular member 8 to inject water obliquely to a conveying direction A of a conveying object, and a rectifying member 24 mounted between the injection nozzles 18 along a circumferential direction of the annular member 8. The conveying object will not fall in the water injection holes 16 even when the conveying object back-flows due to a stop of water injection for sufficiently preventing blockage in the water injection holes 16.