The purpose is to easily and appropriately select some of a plurality of sensors, when making a determination as to the physiological state of a seated person on the basis of measurement results from some of the sensors. A plurality of sensors for measuring fluctuating target measurement values on a seating surface of a seat is arranged such that the coordinates of the locations at which the sensors are arranged differ from one other, where the width direction and front-back direction of the seat are the coordinate axis directions. Also provided are: a storage unit for storing correspondence relationships defined by associating some of the plurality of sensors with individual areas created by dividing the seating surface into a plurality of areas an area identification unit for identifying from among the plurality of areas the area in which the coordinates of the location of the center of gravity of a seated person lies, when the aforementioned two sides have been designated as axial directions of the coordinate axes a sensor selection unit for, on the basis of correspondence relationships stored in the storage unit, selecting from among the plurality of sensors some sensors that correspond to an area identified by the area identification unit and a determination unit for determining the physiological state of a seated person on the basis of measurement results from the selected sensors.La présente invention a pour but de sélectionner facilement et de manière appropriée certains dune pluralité de capteurs, lors de la détermination de létat physiologique dune personne assise, sur la base de résultats de mesure provenant de certains des capteurs. Une pluralité de capteurs, pour mesurer des valeurs de mesure cibles de fluctuation sur la surface dun siège, sont disposés de telle sorte que les coordonnées des emplacements, au niveau desquels les capteurs sont agencés, diffèrent les unes des autres, la direction de largeur et la direction avant-arrière du siège étant les
