< Topic >Being the senior citizen et. al where body capacity decreases, while bathing being conscious personally, the bath time auxiliary tool which can not support the body and it be possible, prevent submergence to maintain the attitude which also the te stabilizes is offered.SolutionsRiding between the side walls to which bathtub 100 faces the bath time auxiliary tool 1 which is laid out, expansion and contraction possible body support component it is provided in both destals of 2 and this body support component according to the interval between the side walls of the bathtub, with the surface this connection section 3a which this touches to the rim surface 102 of the bathtub and this touching to the bathtub side wall inside, regulates the movement to expansion and contraction direction of the body supporter the attachment component 3 which possesses internal this connection section 3b it has.< Choice figure >Drawing 1【課題】身体能力が低下した高齢者等であっても、入浴中に自ら意識して身体を支えなくても安定した姿勢を保つことができ、沈水を防止することができる入浴補助具を提供する。【解決手段】浴槽100の相対する側壁間に跨って配置される入浴補助具1であって、浴槽の側壁間の間隔に応じて伸縮可能な身体支持部材2と、この身体支持部材の両端部に設けられ、浴槽のリム上面102に当接する上面当接部3aと浴槽側壁内面に当接して身体支持部の伸縮方向への移動を規制する内面当接部3bとを有する保持部材3とを備えている。【選択図】図1