PROBLEM TO BE SOLVED: To provide a bed apparatus having a detection system accurately monitoring the movement of a user by determining gravity center moving distance information of the user in two stages, preferably determining information formed by combining weight information of the user along with the gravity center moving distance information, and monitoring the movement of the user fitted to the individuality of the bed user with little erroneous detection at high detection accuracy and high reliability.SOLUTION: When the gravity center position moving distance becomes a first threshold or more within a first time after the weight enters a first range and the weight at that time is within a second range, this bed apparatus enters a monitoring mode and, when the gravity center position moving distance becomes a second threshold or more, which is longer than the first threshold, within a second time from a time base point, which is longer than the first time, using the time point going back from the time when entering the monitoring mode, by the first time as the time base point and the weight at that time is within a third range, detects the rise of the user from the bed.COPYRIGHT: (C)2009,JPO&INPIT【課題】利用者の重心移動量情報を2段階で判断し、更に好ましくは、この重心移動量情報に、利用者の体重情報も組み合わせた情報を判断することによって、より正確に利用者の動きを監視でき、ベッド利用者の個性に合わせて、誤検出が少なくまた検出精度が高く、高信頼性で利用者の動きを監視できる検知システムを備えた寝台装置を提供する。【解決手段】体重が第1の範囲内に入った後第1の時間内に重心位置移動量が第1の閾値以上となり、そのときの体重が第2の範囲内であるときに監視モードに入り、この監視モードに入った時点から第1の時間だけさかのぼった時点を基準時点として、この基準時点から第1の時間より長い第2の時間内に重心位置移動量が第1の閾値より長い第2の閾値以上となり、そのときの体重が第3の範囲内にあるときに利用者の起き上がりを検知する。【選択図】図8
