PROBLEM TO BE SOLVED: To provide a posture stabilizing cushion piece capable of alleviating concentration of a users body pressure, a posture stabilizing cushion, and a method for using the posture stabilizing cushion.SOLUTION: A posture stabilizing cushion piece 10(20) includes at least a pair of side surfaces 12(22) and 14(24), and a supporting surface 16(26) that is provided between the pair of side surfaces 12(22) and 14(24) to support a user 2. The supporting surface 16(26) is inclined from the one side surface 12(24) toward the other side surface 14(22) while being inclined downwards in a front direction.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】利用者の体圧の集中を緩和させることが可能な体位安定クッション片、体位安定クッション及び体位安定クッションの使用方法を提供する。【解決手段】一対の側面12(22),14(24)と、該一対の側面12(22),14(24)間に設けられ、利用者2を支持する支持面16(26)とを少なくとも有する体位安定クッション片10(20)であって、支持面16(26)は、正面方向に向けて下方に傾斜しつつ、一方の側面12(24)から他方の側面14(22)に向けて傾斜している。【選択図】図1