PROBLEM TO BE SOLVED: To provide an on-bed state determination device easily applicable to the bedding part of a different size and accurately determining the on-bed state of a person on the bedding part of a bed even when the bedding part is extended to the outer side of the support part of the bed.SOLUTION: The on-bed state determination device 20 is provided on the bed 10 including the bedding part 11 and support parts 12-15 provided on the bedding part 11 to support the bedding part 11. The on-bed state determination device 20 includes: load detection means 21-24 for detecting loads put on the support parts 12-15 a support part distance measuring means 25 provided in the load detection means 21, for measuring a support part distance L1 to the support part 13 a centroid position computing means 27 for computing the centroid position W of the person on the bedding part 11 on the basis of the loads put on the support parts 12-15 and a state determination means 28 for determining the state of the person on the bedding part 11 on the basis of the support part distance L1 and the centroid position W of the person on the bedding part 11.COPYRIGHT: (C)2011,JPO&INPIT【課題】 大きさの異なる寝床部に容易に適用でき、ベッドの支持部の外側に寝床部が延びる場合でも、ベッドの寝床部上の人の在床状態を正確に判定できる在床状態判定装置を提供すること。【解決手段】 在床状態判定装置20を、寝床部11と寝床部11に設けられ寝床部11を支持する支持部12~15とを備えたベッド10に設け、在床状態判定装置20は、支持部12~15にかかる荷重を検出する荷重検出手段21~24と、荷重検出手段21に設けられ支持部13までの支持部間距離L1を測定する支持部間距離測定手段25と、支持部12~15にかかる荷重に基づいて寝床部11上の人の重心位置Wを演算する重心位置演算手段27と、支持部間距離L1と寝床部11上の人の重心位置Wとに基づいて寝床部11上の人の状態を判定する状態判定手段28と、を備えて構成する。【選択図】 図1
