According to the embodiment, a sanitary washing device includes a nozzle, a valve unit, a casing, a water supply hose, and a water supply connection part. The nozzle is configured to discharge water toward an ano-genital region. The valve unit is provided on a pipe line between a water supply source and the nozzle. The casing stores the nozzle and the valve unit. The water supply hose is flexible and configured to supply water from the water supply source into the casing. The water supply connection part connects the water supply hose and the valve unit. The water supply connection part is open in a horizontal direction. The water supply hose is directly connected to the water supply connection part in a horizontal direction. The casing includes a hose container in which a portion of the water supply hose can be stored by bending.