The present invention relates to a reservoir of a bidet to be mounted on the toilet seat, and more particularly to a bidet reservoir to reduce the temperature deviation of the water discharged when the water stored in the reservoir at a constant temperature in the cleaning of the anus and the like.;According to the present invention, in a water tank in which a hot water heater is mounted, a water outlet portion mounted horizontally with a temperature sensor on the water tank cover includes a water extraction rod mounted on the water tank cover and connected to a nozzle, and a lower end of the water extraction rod. Since the ribs are arranged on the upper inner side so that the upper outlet is formed between the outlet rods and the lower outlet is formed at one end of the lower inner side when the fastening is inserted through the outlet, It is to provide a bidet reservoir for reducing the temperature deviation of the water discharged to the nozzle.
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