To provide a washing water injection mechanism of a sanitary washing device capable of obtaining the sufficient intermittent effect of washing water and, at the same time, simplifying and compacting the constitution thereof at a low cost.

A washing water injection mechanism of a sanitary washing device includes a nozzle main body 10 mounted to a part of an opening of a toilet seat and arranging injection outlets for discharging washing water to the private parts to the front end thereof. Then, three injection outlets are arranged to a wall surface of the front end 11 of the nozzle main body 10 forming a nozzle 1, a room 3 connecting to a washing water channel 4 is formed in the front end of the nozzle main body 10, and a plurality of wing surfaces 51 providing torque therewith by the operation of washing water supplied inside of the room 3 are included. A connecting relation between the injection outlets and the room 3 supplying washing water thereinto is intermittently controlled, and a rotational wing body 5 having an intercepting surface capable of making intermittent injection from the injection outlets is inserted into the room 3 in a rotatable manner.