PROBLEM TO BE SOLVED: To enable to appropriately determine whether or not a human subject is present on a bottom bedding.SOLUTION: A present-on-bed determination apparatus 1 includes: a sensor unit 2 usable with a bottom bedding M and configured to measure biological displacement of a human subject on the bottom bedding M so as to output a measurement signal showing a measurement result a first signal processing unit 7 configured to amplify the measurement signal with a first gain G1 so as to output a first output signal a first AD conversion unit 90 configured to output a plurality of first level values obtained by AD conversion of the first output signal and a determination unit 94 configured to determine whether or not the human subject is present on the bottom bedding in accordance with a dispersion indicator σ that indicates dispersion degree of the plurality of the first level values.COPYRIGHT: (C)2013,JPO&INPIT【課題】被験者が在床しているか否かを適切に判定可能とする。【解決手段】在床判定装置1が、敷寝具Mと共に使用可能であり、敷寝具M上における被験者の生体変位を測定し、測定結果を示す測定信号を出力するセンサ部2と、測定信号を第1ゲインG1で増幅して第1出力信号として出力する第1信号処理部7と、第1出力信号をAD変換して得た複数の第1レベル値を出力する第1AD変換部90と、複数の第1レベル値のばらつきの程度を示すばらつき尺度σに応じて、被験者が在床しているか否かを判定する判定部94とを備える。【選択図】図1
