PROBLEM TO BE SOLVED: To provide a posture holder allowing a seating person to comfortably sit in a further correct posture.SOLUTION: The posture holder includes: a base layer 100 including a buttock-side base part 101 that constitutes a back side of a buttock support part 1, and has a surface formed of a curved surface that is curved such that both left/right ends are located at an upper side with respect to a left/right central part, and a lumbar-side base part 102 that is continued from a rear end of the buttock-side base part 101, constitutes a back side of a lumbar support part 2, and has a surface formed of a curved surface that is curved such that both left/right ends are located at a front side with respect to a left/right central part； and a cushion layer 40 that is formed of a low-repulsive urethane foam, covers the surface of the base layer 100 to form surface sides of the buttock support part 1 and the lumbar support part 2, and has a thick part, both left/right sides of which are thicker than a left/right central part so as to, when a seating person H sits thereon, deform into a specific uneven shape for supporting the buttocks and the lumbar part of the seating parson H.SELECTED DRAWING: Figure 2【課題】着座者が楽に正しい姿勢で着座することができる姿勢保持具を提供する。【解決手段】姿勢保持具は、臀部支持部１の裏面側を構成し、左右両端部が左右中央部に比べて上側に位置するように湾曲した湾曲面で形成された表面を有する臀部側ベース部１０１、及びこの臀部側ベース部１０１の後端に連続しており、腰部支持部２の裏面側を構成し、左右両端部が左右中央部に比べて前側に位置するように湾曲した湾曲面で形成された表面を有する腰部側ベース部１０２を具備したベース層１００と、低反発ウレタンフォームで形成されており、ベース層１００の表面を覆って臀部支持部１及び腰部支持部２の表面側を構成し、着座者Ｈが着座すると着座者Ｈの臀部及び腰部を支持する特定の凹凸形状に変形するように左右中央部よりも左右両側に厚みが厚い部分を有したクッション層４０とを備えている。【選択図】図２
