Abstract: A temperature difference detecting element utilizing thermoelectromotive force which is generated by a Seebeck effect when temperature gradients are applied to a semiconductive ceramic material. A substrate has a plurality of thermoelements. Each thermoelement comprises a semiconductive ceramic material and a pair of hot-side and cold-side electrodes which are provided on the semiconductive ceramic material with a prescribed spacing, to form a hot junction and a cold junction respectively. A plurality of such hot-side electrodes are arranged on a first region of the substrate to be adjacent to each other, while a plurality of such cold-side electrodes are arranged on a second region of the substrate to be adjacent to each other. The plurality of thermoelements are sequentially connected in series with each other by electrically connecting, for example, the hot-side electrodes of the thermoelements with the cold-side electrodes of those adjacent thereto.