The present disclosure relates to a bidet that forms a pollution-preventing water film that prevents contamination of a cleaning nozzle, and the bidet according to the present disclosure includes a main body mounted at an upper side of a toilet bowl, wherein a ceramic ware containing an excrement of a user is formed in the toilet bowl; a toilet seat provided to the main body and forming a seating surface on which the user sits; a cleaning nozzle coupled to the main body and spraying cleaning water to wash the user's body; a pollution prevention module provided to the main body and including an outlet for discharging pollution-preventing water to prevent contamination of the cleaning nozzle; and a controller configured to control an operation of the pollution prevention module, wherein the outlet of the pollution prevention module discharges the pollution-preventing water to a front surface of the cleaning nozzle so that a surface of the main body is opened at a position spaced upward from the cleaning nozzle, and a pollution-preventing water film is discharged from the outlet into the ceramic ware of the toilet bowl to block a space between the user and the cleaning nozzle.