To provide a sanitary washing device capable of preventing the occurrence of inconvenience such as water leakage, etc., caused by damages in a water supply port even when the water supply port is clampd with excessive torque in a joint process in a job site.

In a sanitary washing device for washing the private parts by connecting service water such as city water, etc., to the main body thereof with a water supply pipe, clamping torque generated in the rotational direction in a joint process of a water supply pipe and a water supply port 4 of the sanitary washing device executed in a job site is kept by controlling the movement in the rotational direction with a separate component. By the constitution, load torque to the water supply port is reduced.