The invention provides a sanitary washing device capable of suppressing decrease of detection accuracy of the radio wave sensor. Specifically, the sanitary washing device includes a main part and a radio wave sensor, wherein the main part includes a first nozzle and a flow channel switching unit; the first nozzle discharges water toward a human private part; the flow channel switching unit includes a motor and switches a flow channel of water flowing toward the first nozzle by an operation of the motor; the radio wave sensor is provided in an interior of the main part and uses a radio wave todetect a user in front of the main part; the radio wave sensor includes a radio wave transmitter/receiver and a controller; the radio wave transmitter/receiver radiates the radio wave and receives theradio wave reflected by the user; the controller determines a state of the user based on the radio wave received by the radio wave transmitter/receiver and outputs, to the main part, a signal relating to a determination result; the main part controls an operation of the flow channel switching unit and the first nozzle based on the signal; and the first nozzle is positioned between the radio wavesensor and the motor in a width direction of the first nozzle.