PROBLEM TO BE SOLVED: To provide a sitting position holding cushion that can prevent collapse of a sitting posture caused by leaning of an upper half body, forward displacement of a hip part, or the like, can cope with seated persons with different physiques, and can be used while being placed not only on a specific chair but on various chairs used daily.SOLUTION: A sitting position holding cushion includes: a U-shaped cushion body 1 having left and right linear parts and a bent part connecting one ends of the linear parts; a bag-like cover body 2 for storing the cushion body; a crotch belt type mounting tool 3 fitted to a front side of the bag-like cover body; and chair fixing belts 4 provided at a back side or both side parts of the bag-like cover body.SELECTED DRAWING: Figure 1【課題】上半身の倒れや臀部の前ズレ等によって生じる着座姿勢の崩れを防止できるだけでなく、体型の異なる着座者にも対応可能で、しかも、特定の椅子だけでなく日常で使用する様々な椅子に載せ替えて使用できる座位保持用クッションを提供する。【解決手段】左右の直線部とこれらの一端同士を繋ぐ屈曲部とを有するU字状のクッション本体1とこのクッション本体が収容される袋状カバー体2とこの袋状カバー体の表面側に取着された股ベルト式装着具3と前記袋状カバー体の裏面側または両サイド部に付設された椅子固定用ベルト4とを含んで構成した。【選択図】図1