An adapter includes a detection unit configured to detect an operating state of an illumination fixture, a communication unit configured to communicate with an analysis device, and a control unit configured to cause the communication unit to transmit a detection result of the detection unit to the analysis device. A lighting system includes a plurality of illumination devices. A life support system includes the plurality of illumination devices, and the analysis device configured to analyze behavior of a person. The plurality of illumination devices each include the adapter.