A sensor device comprising: difference calculation means that calculates the difference between a predetermined threshold and a current measured value measured by a sensor unit that measures a measurement subject; a change amount recording unit that records the maximum amount of change of the measured value for calculated differences with respect to elapsed time on the basis of a plurality of measured value history records obtained by measuring the measurement subject; minimum time calculation means that calculates the minimum arrival time, that is the minimum time for the measurement subject to arrive at the predetermined threshold, from the current measured value on the basis of the calculated difference and the recorded maximum amount of change wherein - the minimum time calculation means calculates, as the minimum arrival time, the shortest elapsed time of elapsed times for the maximum amount of change for the value of the calculated difference, wherein the change amount recording unit records the maximum amount of change for each of a plurality of elapsed times, or - the minimum time calculation means calculates, as the minimum arrival time, a quotient obtained by dividing the calculated difference by the maximum amount of change per unit time, wherein the change amount recording unit records the maximum amount of change per unit time; measurement time determination means that chooses, as the time of the next measurement of the measurement subject, the calculated minimum arrival time provided it is greater than the minimum time interval at which the sensor device can measure, and otherwise chooses this minimum time interval; and sensor control means that controls the sensor unit in a manner so as to measure the measurement subject at the chosen time. difference calculation means that calculates the difference between a predetermined threshold and a current measured value measured by a sensor unit that measures a measurement subject; a change amount recording unit that records the maximum amount of change of the measured value for calculated differences with respect to elapsed time on the basis of a plurality of measured value history records obtained by measuring the measurement subject; minimum time calculation means that calculates the minimum arrival time, that is the minimum time for the measurement subject to arrive at the predetermined threshold, from the current measured value on the basis of the calculated difference and the recorded maximum amount of change wherein - the minimum time calculation means calculates, as the minimum arrival time, the shortest elapsed time of elapsed times for the maximum amount of change for the value of the calculated difference, wherein the change amount recording unit records the maximum amount of change for each of a plurality of elapsed times, or - the minimum time calculation means calculates, as the minimum arrival time, a quotient obtained by dividing the calculated difference by the maximum amount of change per unit time, wherein the change amount recording unit records the maximum amount of change per unit time; - the minimum time calculation means calculates, as the minimum arrival time, the shortest elapsed time of elapsed times for the maximum amount of change for the value of the calculated difference, wherein the change amount recording unit records the maximum amount of change for each of a plurality of elapsed times, or - the minimum time calculation means calculates, as the minimum arrival time, a quotient obtained by dividing the calculated difference by the maximum amount of change per unit time, wherein the change amount recording unit records the maximum amount of change per unit time; measurement time determination means that chooses, as the time of the next measurement of the measurement subject, the calculated minimum arrival time provided it is greater than the minimum time interval at which the sensor device can measure, and otherwise chooses this minimum time interval; and sensor control means that controls the sensor unit in a manner so as to measure the measurement subject at the chosen time.