BATHTUB WASHING APPARATUS

PROBLEM TO BE SOLVED: To provide a bathtub washing apparatus capable of surely washing the inside of a bathtub by automatically determining an actual waterline position to which dirt is considered to stick most, according to an actual bathing situation, and washing the actual waterline position emphatically.SOLUTION: A draft surface water level when a bather actually bathes from a reference water level Ls in a non-bathing time is detected by a water level sensor. In the same state filled with hot water, if a different bather bathes, an upper limit value La and a lower limit value Lb of the draft surface water level are updated. When washing is carried out after draining bathtub water, the discharge flow from a washing nozzle 24 is changed and adjusted by a flow regulating valve so that washing water from the washing nozzle 24 is jetted to the upper and lower waterline positions corresponding to the acquired upper limit value La and lower limit value Lb.