To provide a sensor system which can easily obtain how long an object to be measured by the sensor system has been left in a state of abnormal measured values for the object to be measured and examine information required for quality control in a short time and efficiently.

The sensor system comprises a sensor for measuring the object to be measured at a constant interval of time and detecting a measured value, a time measuring section for measuring a measurement time when measured by the sensor, a measured value measurement time information writing section for correlating the measured value information by the sensor with the measurement time by the time measuring section and writing them into a memory, the memory in which safety value information specifying a safety range of the measured value is stored in advance, a measured value decision section for deciding whether the measured value measured by the sensor is within or out of the safety range, and an abnormal information writing section for, when the decision by the measured value decision section has been decided to be out of the safety range, storing all the measured values and measurement times from the measurement immediately one before decided to be out of the safety range to the measurement decided again to be within the safety range in the memory as abnormal information.

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