Provided is a state management device (200), comprising: an extraction unit (232) which, from measurement information (222) in which time periods are associated with measurement values which are measured in the time periods by a first device and proximity information which signifies whether the first device and a second device are in proximity in the time periods, refers to the proximity information and extracts either proximity time periods which are time periods in which the first device and the second device are in proximity or non-proximity time periods which are time periods in which the first device and the second device are not in proximity; and an output unit (235) which uses the measurement values which are associated with the extracted proximity time periods or non-proximity time periods to determine a state change in the subject wearing the first device and outputs the determined result.
