According to one embodiment, a sanitary washing device includes a main part, a toilet seat, and a sensor. The toilet seat is supported to be rotatable. The sensor is provided in an interior of the main part and uses a radio wave to detect a user in front of the main part. A position of the sensor does not change. In a state in which the toilet seat is closed, the user in front of the main part is detected by the sensor in a first region and a second region higher than the first region. In a state in which the toilet seat is open, the user in front of the main part is detected by the sensor in the first region without the user in front of the main part being detected by the sensor in the second region.