The present invention relates to a bathing auxiliary chair which is suitable for bathtubs of different sizes to facilitate users to sit thereon while bathing. The bathing auxiliary chair includes a seating unit which allows a user to sit thereon. The seating unit is supported by a supporting unit and can be moved between a first position and a second position. In use, when the seating unit is located at the first position or the second position, a front guide shell of the seating unit can be coupled to a front tube of the supporting unit through a positioning button of an elastic unit, and a rear guide shell can abut against a fastener located at the supporting unit, so that a seat portion of the seating unit can be fixed at the position reliably, and the bathing auxiliary chair can be used safely.本發明有關一種洗澡輔助椅，其適於跨置在不同尺寸之浴缸上以提供使用者乘座洗澡。該輔助椅包含可提供使用者乘坐的一乘坐單元，該乘坐單元受一支撐單元支撐且可在一第一位置與一第二位置之間移動。當該乘坐單元在該第一位置或該第二位置時，該乘坐單元的前座管與該支撐單元的前管會受一彈性單元的定位鈕結合，且該乘坐單元的後座管會抵靠於該支撐單元的定位件，使得乘坐單元的坐部具有牢靠的定位，達成提高使用的安全性。
