There are provided a sensor device and a sensor system that consume less power, can be miniaturized, and are excellent in productivity. The sensor device has: a unit 1 having at least one type of power supply portion 13 selected from a power generation portion and a wireless power supply portion, a sensor portion 11 that detects target information and outputs a signal, a logic portion 12 that performs determination based on the signal, and a wireless communication portion 14 that transmits a result of the determination to the outside and a sealing material that covers at least a part of the outer periphery of the unit 1. The unit 1 has the respective portions on one semiconductor substrate surface, and the respective portions are electrically connected to each other. Alternatively, the respective portions are formed on a plurality of semiconductor substrates, the semiconductor substrates on which the respective portions are formed are laminated, and the respective portions are electrically connected to each other. The sensor system includes the sensor device described above and a communication device.
