To provide a water spraying nozzle which has an excellent spraying characteristic and good controllability from high load to low load regardless of the state of superheated steam and a desuperheater for the superheated steam.

An outer tube 16 is water-tightly protruded into the inside of a steam connecting tube 6 communicating with a superheater, the inside of the outer tube is partitioned into a plurality of independent water chambers 27, 28 and 29, spray nozzles 31, 32 and 33 communicating with each of water chamber are arranged on the outer tube, each of the water chambers is connected with each of opening and closing valves 40, 41 and 42, a plurality of water spray nozzles 15, wherein the opening and closing valve is connected with a water supply source 3 through a flow control valve, are provided, a temperature sensor sensing the temperature of the steam flowing through the steam connecting tube is provided, and after selecting a motor opening and closing valve according to the flow of the spray water to keep the steam temperature sensed by the temperature sensor at predetermined temperature, a flow control valve is controlled.