To provide a jet type hydraulic turbine for a pressure line capable of taking out almost constant driving force without being influenced by the fluctuation of flow and without providing a complicated a guide vane mechanism by making fluid pressure act as a main force on an impeller, and applying the force of turbulent flow generated by flow, to the fluid pressure.

An impeller 4 is rotatably built in a casing 2 with an inlet 8 and an outlet 9 connected to an intermediate part of a pressurized fluid line, and a jet path 10 generating jet action to blades of the impeller 4 while making a fluid flow along the rotating direction of the impeller 4 is provided on the inner peripheral surface of the casing 2, between the inlet 8 and outlet 9 along the rotating direction of the impeller 4. The jet path 10 is continuous in corrugated shape with corrugated grooves and fixed blades 11 along the inner peripheral surface of the casing 2, and the inner peripheral side top parts of the corrugation is opened to the inner peripheral surface of the casing 2. The downstream side of each fixed blade 11 forms a jet nozzle 13 at the opening part. The jet nozzles 13 make fluid pressure act as a main force on the blades of different pitches, and the force of turbulent flow generated by flow is applied to the fluid pressure to drive the impeller 4.