The present invention who decline of muscle strength, sitting next to bed, when the rehabilitation and dining, easy mounting is, less burden on caregivers in lightweight, it is reliable and stable sitting posture holding, storage, during transport to provide a sitting position retention tool that can be in a compact form. The invention relates to connect the base 1 of the plate-like left and right in the pipe made of the connecting frame 2, and a seating section with no U-shaped frame, Standing in a direction substantially perpendicular to the back frame 3 made of pipe from the rear of the left and right base Raise, attach the back plate and the backrest cushion on the back frame and the backrest, from the middle of the left and right rising portion of the back frame, substantially issues a horizontal shaft 12 forward, and armrest in combination with armrest cushion 11. Furthermore, the L-shaped latch member 4 telescopic is attached to the left and right base, a hook 5 parts of metal tip tuck lateral bed, to fix the bracket is hung at the proper back position by a clamp 7.BACKGROUND.【課題】筋力の衰えた人が、ベッド横に座り、リハビリや飲食をする時、装着が容易で、軽量で介護者の負担が少なく、確実で安定な座位姿勢保持が出来、保管、運搬時にコンパクトな形に出来る座位保持用具を提供する。【解決手段】板状の左右のベース1をパイプ製の連結枠2でつなぎ、着座部のないコの字形の枠とし、その左右ベースの後部よりパイプ製の背枠3を略垂直方向に立ち上げ、背枠に背板と背もたれ用クッションを取り付け、背もたれとし、背枠の左右立ち上がり部分の中程から、略水平方向前方に支軸12を出し、肘掛用クッション11と組み合わせて肘掛けとする。また、左右ベースに伸縮自在のL字状の掛け金具4を装着し、金具先端のフック5部分でベッドの横を抱え込み、適正な背もたれ位置で掛け金具をクランプ7で固定する。【選択図】図1