To provide a liquid injecting nozzle capable of accurately and continuously injecting an injected liquid into a liquid and a liquid injecting/mixing device that dispenses with mixing/stirring at a rear stage using the nozzle.

The liquid injecting nozzle 1 "which keeps both ends connected to a pipe 2 that sends the liquid into which the injection liquid is injected" injects the injected liquid into the liquid, wherein an injected liquid introducing passage 5 where the injected liquid is introduced into the liquid injecting nozzle by self-priming and a plurality of passages 3 into/out which the liquid comes are provided, liquid draining holes 3b on the draining side of the passages 3 are opened in a mixing chamber 4 by enclosing an injected liquid injection holes 5b on the draining side of the passage 5, the chamber 4 is provided in communication with an injection chamber 4a in which the injected liquid flowing from the holes 5b is injected into the liquid flowing from the holes 3b, and a stirring chamber 4b which has a diameter than the chamber 4a that stirs the liquid and the injected liquid is provided.

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