Problem to be solved: to provide a clamp mechanism of a bathing auxiliary tool which can be easily attached to the bathtub side wall in a short time and attached to the bathtub side wall.Solution: a body frame for supporting a retaining member abutting against an outer surface and an upper surface of a bathtub side wall and a moving frame supporting a narrow member abutting on an inner surface of a bathtub side and a moving operation means for moving the moving side frame to the main frame, and a moving operation means a head with a knob The screw member is provided with a lever on the end surface and a guide attached to the moving frame, and the screw shaft is axle on the main frameThe clamp mechanism of the bathing auxiliary tool in which the lever is pivotally supported by the guide, and the lever is pivotally supported by the guide, and the end surface where the screw thread of the lever is formed is urged against the screw shaft portion of the screw member so that the screw shaft portion of the screw shaft portion and the end surface of the lever can be screwed.Diagram【課題】浴槽側壁に取り付けられる入浴用補助具を短時間で容易に浴槽側壁に取り付け、取り外しが行える入浴用補助具のクランプ機構を提供する。【解決手段】浴槽側壁の外面および上面に当接する狭持部材を支持する本体フレームと浴槽側壁の内面に当接する狭持部材を支持する移動側フレームと移動側フレームを本体フレームに対して進退させる移動操作手段とを備え、移動操作手段は、頭部がノブであるネジ部材とネジ部材のネジ軸部に螺合することができるネジ山が端面に形成されたレバーと移動側フレームに取り付けたガイドとを備え、ネジ部材は、ネジ軸部が本体フレームに軸方向に進退自在および回動自在に係合され、レバーはガイドに軸支され、バネ機構により、レバーのネジ山が形成された端面をネジ部材のネジ軸部に付勢して、該ネジ軸部のネジ軸部とレバーの端面とが螺合できるようにした入浴用補助具のクランプ機構。【選択図】図3