An injection nozzle for a bidet is provided to increase washability by cutting off the jet of washing water periodically while jetting out washing water and jetting out washing water at high pressure instantaneously. The invention relates to an injection nozzle for a bidet formed by placing a rotary body(30) in a space of a nozzle head(22) of a main body(20), wherein the main body is formed in the shape of a long pipe to guide washing water and provided with a space formed in a nozzle head, a nozzle port formed on the top of the nozzle head to jet out washing water and shaft supports formed on the ceiling and bottom of the space to support the top and bottom of a rotary shaft of the rotary body, and the rotary body is composed of a rotary shaft(32) placed perpendicular to the shaft supports of the space and blades formed on the outer circumferential surface of the rotary shaft and rotated by the washing water jet pressure to make each blade surface approach the ceiling of the space and open/close the nozzle port periodically.
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