PURPOSE: To provide a rotary injection nozzle capable of easily controlling the number of revolution and providing it at a low cost.

CONSTITUTION: In a rotary injection nozzle having a base body freely attachably and detachably fitted to the tip of the feeding pass for a high pressure fluid and a rotor having an injection nozzle and also freely rotatably supported on the base body and where a flow passage leading to the injection nozzle from the feeding pass is formed in the base body and the rotor, the flow passage 25 in the base body 14 is formed on the rotation central axis of the rotor and also a twist plate 30 twisted around the rotation central axis is fitted in the flow passage 25. The twist plate 30 is formed of a thin metal piece, and the degree of twist is controlled by its plastic deformation.