To provide a sheet capable of detecting with high-sensitivity the posture change of a bedded person while suppressing relative positional deviation between a state detection sheet and a sheet covering body.SOLUTION: A sheet 10 which is arranged so as to cover at least a top face of an elastically deformable cushioning material such as a mattress 4 provided on a bed 1 comprises: a state detection sheet 14 in which a state detection member 20 expanding and contracting integrally with a sheet body 11 with elasticity, and converting change in an expansion and contraction state of the sheet body 11 into change in electrical characteristics is arranged in a partial area of the sheet body 11； and a sheet covering body 15 which is overlappedly arranged on the state detection sheet 14, and extends with the extension of the sheet body 11. A restraint area BA for restraining mutually so as not to cause deviation of a relative position between the sheet covering body 15 and the state detection sheet 14, and a non-restraint area NBA for allowing deviation of the relative position are defined, and the state detection member 20 is arranged in the non-restraint area NBA.SELECTED DRAWING: Figure 1【課題】状態検出敷布と敷布被覆体との相対的な位置ずれを抑制しながらも、在床者などの姿勢変化を高感度に検出可能な敷布を提供する。【解決手段】ベッド１に備えたマットレス４などの弾性変形可能なクッション材の少なくとも上面を覆うように配置される敷布１０であって、伸縮性を備えた敷布本体１１と一体に伸縮し前記敷布本体１１の伸縮状態の変化を電気特性の変化に変換する状態検出部材２０が前記敷布本体１１の一部領域に配された状態検出敷布１４と、前記状態検出敷布１４に重畳配置され前記敷布本体１１の伸長に伴って伸長する敷布被覆体１５と、を備え、前記敷布被覆体１５と前記状態検出敷布１４との相対位置がずれないように相互を拘束する拘束領域ＢＡと、前記相対位置のずれを許容する非拘束領域ＮＢＡとが区画され、前記非拘束領域ＮＢＡに前記状態検出部材２０が配されている。【選択図】図１
