In recent years, many medical appliances such as an endoscope, a medical manipulator, and the like, which have a tubular portion which is long and thin and a tip end thereof is inserted into a body cavity for observation or an operation, have been developed and used. Since the medical appliances are used by being inserted into a body cavity of a patient, from a hygiene viewpoint for prevention of infection, it is necessary to wash and clean both inside and outside of the medical appliances for them to be clean, by washing treatment such as washing, sterilizing, and rinsing, or with combination thereof, when re-using the medical appliances. However, since the medical appliances have long and thin tubes as those are necessary for functions and usages, a cleaning agent or a disinfectant does not sufficiently pass through the inside of the thin tubes during the washing treatment.
A washing treatment apparatus and a washing treatment method of the related art for such medical appliances having a thin tubular structure are disclosed in Patent Literature 1, for example. The washing treatment apparatus of the related art includes a washing bath in which an endoscope is loaded, a connection tube to which at least a washing solution is supplied, a guide member which guides the connection tube to an axial direction of a channel port of the endoscope provided on an external side of the washing bath, a movement mechanism which moves the connection tube through the guide member, a sealing member for sealing the connection tube and the channel port, and a partition which forms a sealed structure in which the movement mechanism and a part of the connection tube are provided.