The utility model relates to a sensor for a pillow, which comprises a sensor and is characterized by further comprising a first carrier, a second carrier and a fixing part, the first carrier and the second carrier can be oppositely combined, and the fixing part can fix the sensor on the joint surface of the first carrier and/or the second carrier. The distance between the two fixing holes is larger than the length of the strip-shaped sensor, so that the fixed strip-shaped sensor is tightened under the transverse stress of the elastic carrier, the sensitivity of the sensor can be improved, thephysiological sign parameters of a human body during sleep can be accurately detected, and consumers can better obtain sleep information.