PROBLEM TO BE SOLVED: To provide a bathing apparatus in which a bathtub, a reflux duct and a hot water storage tank can be cleaned with stored water agitated and maintained at a constant concentration level, and to provide a method for washing the bathing apparatus.SOLUTION: The bathing apparatus, in which a bathtub and a hot water storage tank are installed, the bathtub and the hot water storage tank communicate with each other through a reflux duct and stored water of the hot water storage tank is transferred to the bathtub by a pump equipped in the reflux duct, includes an agitating device which agitates the stored water and detergent at the bathtub or the hot water storage tank and the agitated stored water flows back between the bathtub and the hot water storage tank by the pump.COPYRIGHT: (C)2008,JPO&INPIT【課題】攪拌されて洗浄剤の濃度が一定になった貯水で、浴槽、還流管路及び貯湯タンクの洗浄が可能な入浴装置及び入浴装置の洗浄方法を提供することにある。【解決手段】浴槽と貯湯タンクとを有し、該浴槽と該貯湯タンクとが還流管路で連通され、該還流管路に設けられたポンプにより該貯湯タンクの貯水を該浴槽に移す入浴装置において、洗浄剤を投入した貯水を攪拌する攪拌装置を浴槽又は貯湯タンクに備え、攪拌された貯水を、ポンプを用いて浴槽と貯湯タンクとの間で還流させることを特徴とする。【選択図】図1